Merge branch 'improve-contributing' into 'master'

Improve the contribution and MR review guide

## What does this MR do?

This merge request improves the contributing and MR review guides following @stanhu's reply on https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6096#note_16537211.

## Why was this MR needed?

To clearly state that MR reviews can take multiple iterations but that as reviewers we should do our best to minimize the number of iterations and take over any MR that is set as "Merge when build succeeds" at some point.

See merge request !6739

CONTRIBUTING.md

@@ -226,8 +226,7 @@ a feedback issue (if there isn't one already) and leave a comment asking for it
 to be marked as `Accepting merge requests`. Please include screenshots or
 wireframes if the feature will also change the UI.
 
-Merge requests can be filed either at [GitLab.com][gitlab-mr-tracker] or at
-[github.com][github-mr-tracker].
+Merge requests should be opened at [GitLab.com][gitlab-mr-tracker].
 
 If you are new to GitLab development (or web development in general), see the
 [I want to contribute!](#i-want-to-contribute) section to get you started with
@@ -246,10 +245,17 @@ tests are least likely to receive timely feedback. The workflow to make a merge
 request is as follows:
 
 1. Fork the project into your personal space on GitLab.com
-1. Create a feature branch, branch away from `master`.
+1. Create a feature branch, branch away from `master`
 1. Write [tests](https://gitlab.com/gitlab-org/gitlab-development-kit#running-the-tests) and code
-1. Add your changes to the [CHANGELOG](CHANGELOG)
-1. If you are writing documentation, make sure to read the [documentation styleguide][doc-styleguide]
+1. Add your changes to the [CHANGELOG](CHANGELOG):
+  1. If you are fixing a ~regression issue, you can add your entry to the next
+     patch release (e.g. `8.12.5` if current version is `8.12.4`)
+  1. Otherwise, add your entry to the next minor release (e.g. `8.13.0` if
+     current version is `8.12.4`
+  1. Please add your entry at a random place among the entries of the targeted
+     release
+1. If you are writing documentation, make sure to follow the
+   [documentation styleguide][doc-styleguide]
 1. If you have multiple commits please combine them into one commit by
    [squashing them][git-squash]
 1. Push the commit(s) to your fork
@@ -258,7 +264,7 @@ request is as follows:
 1. The MR description should give a motive for your change and the method you
    used to achieve it, see the [merge request description format]
    (#merge-request-description-format)
-1. If the MR changes the UI it should include before and after screenshots
+1. If the MR changes the UI it should include *Before* and *After* screenshots
 1. If the MR changes CSS classes please include the list of affected pages,
    `grep css-class ./app -R`
 1. Link any relevant [issues][ce-tracker] in the merge request description and
@@ -270,7 +276,9 @@ request is as follows:
    [shell command guidelines](doc/development/shell_commands.md)
 1. If your code creates new files on disk please read the
    [shared files guidelines](doc/development/shared_files.md).
-1. When writing commit messages please follow [these](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html) [guidelines](http://chris.beams.io/posts/git-commit/).
+1. When writing commit messages please follow
+   [these](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html)
+   [guidelines](http://chris.beams.io/posts/git-commit/).
 1. If your merge request adds one or more migrations, make sure to execute all
    migrations on a fresh database before the MR is reviewed. If the review leads
    to large changes in the MR, do this again once the review is complete.
@@ -305,23 +313,6 @@ Please ensure that your merge request meets the contribution acceptance criteria
 When having your code reviewed and when reviewing merge requests please take the
 [code review guidelines](doc/development/code_review.md) into account.
 
-### Merge request description format
-
-Please submit merge requests using the following template in the merge request
-description area. Copy-paste it to retain the markdown format.
-
-```
-## What does this MR do?
-
-## Are there points in the code the reviewer needs to double check?
-
-## Why was this MR needed?
-
-## What are the relevant issue numbers?
-
-## Screenshots (if relevant)
-```
-
 ### Contribution acceptance criteria
 
 1. The change is as small as possible
@@ -333,8 +324,8 @@ description area. Copy-paste it to retain the markdown format.
    aforementioned failing test
 1. Your MR initially contains a single commit (please use `git rebase -i` to
    squash commits)
-1. Your changes can merge without problems (if not please merge `master`, never
-   rebase commits pushed to the remote server)
+1. Your changes can merge without problems (if not please rebase if you're the
+   only one working on your feature branch, otherwise, merge `master`)
 1. Does not break any existing functionality
 1. Fixes one specific issue or implements one specific feature (do not combine
    things, send separate merge requests if needed)
@@ -352,7 +343,10 @@ description area. Copy-paste it to retain the markdown format.
       entire line to follow it. This prevents linting tools from generating warnings.
     - Don't touch neighbouring lines. As an exception, automatic mass
       refactoring modifications may leave style non-compliant.
-1. If the merge request adds any new libraries (gems, JavaScript libraries, etc.), they should conform to our [Licensing guidelines][license-finder-doc]. See the instructions in that document for help if your MR fails the "license-finder" test with a "Dependencies that need approval" error.
+1. If the merge request adds any new libraries (gems, JavaScript libraries,
+   etc.), they should conform to our [Licensing guidelines][license-finder-doc].
+   See the instructions in that document for help if your MR fails the
+   "license-finder" test with a "Dependencies that need approval" error.
 
 ## Changes for Stable Releases
 
@@ -468,7 +462,6 @@ available at [http://contributor-covenant.org/version/1/1/0/](http://contributor
 [accepting-mrs-ce]: https://gitlab.com/gitlab-org/gitlab-ce/issues?label_name=Accepting+Merge+Requests
 [accepting-mrs-ee]: https://gitlab.com/gitlab-org/gitlab-ee/issues?label_name=Accepting+Merge+Requests
 [gitlab-mr-tracker]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests
-[github-mr-tracker]: https://github.com/gitlabhq/gitlabhq/pulls
 [gdk]: https://gitlab.com/gitlab-org/gitlab-development-kit
 [git-squash]: https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits
 [closed-merge-requests]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests?assignee_id=&label_name=&milestone_id=&scope=&sort=&state=closed

doc/development/code_review.md

@@ -34,6 +34,10 @@ request is up to one of our merge request "endbosses", denoted on the
 
 ## Having your code reviewed
 
+Please keep in mind that code review is a process that can take multiple
+iterations, and reviewers may spot things later that they may not have seen the
+first time.
+
 - The first reviewer of your code is _you_. Before you perform that first push
   of your shiny new branch, read through the entire diff. Does it make sense?
   Did you include something unrelated to the overall purpose of the changes? Did
@@ -55,6 +59,7 @@ request is up to one of our merge request "endbosses", denoted on the
 Understand why the change is necessary (fixes a bug, improves the user
 experience, refactors the existing code). Then:
 
+- Try to be thorough in your reviews to reduce the number of iterations.
 - Communicate which ideas you feel strongly about and those you don't.
 - Identify ways to simplify the code while still solving the problem.
 - Offer alternative implementations, but assume the author already considered
@@ -64,8 +69,10 @@ experience, refactors the existing code). Then:
   someone else would be confused by it as well.
 - After a round of line notes, it can be helpful to post a summary note such as
   "LGTM :thumbsup:", or "Just a couple things to address."
-- Avoid accepting a merge request before the build succeeds ("Merge when build
-  succeeds" is fine).
+- Avoid accepting a merge request before the build succeeds. Of course, "Merge
+  When Build Succeeds" (MWBS) is fine.
+- If you set the MR to "Merge When Build Succeeds", you should take over
+  subsequent revisions for anything that would be spotted after that.
 
 ## Credits