Add info about WIP merge requests to docs.

app/views/projects/merge_requests/show/_mr_accept.html.haml

@@ -49,7 +49,7 @@
 
   .automerge_widget.cannot_be_merged.hide
     %h4
-      This pull request contains merge conflicts that must be resolved.
+      This merge request contains merge conflicts that must be resolved.
       You can try it manually on the
       %strong
         = link_to "command line", "#modal_merge_info", class: "how_to_merge_link vlink", title: "How To Merge", "data-toggle" => "modal"
@@ -63,14 +63,14 @@
 
   .automerge_widget.work_in_progress.hide
     %h4
-      This request cannot be merged because it is marked as <strong>Work In Progress</strong>.
+      This merge request cannot be accepted because it is marked as Work In Progress.
 
     %p
       %button.btn.disabled{:type => 'button'}
         %i.fa.fa-warning
         Accept Merge Request
       &nbsp;
-      When the merge request is ready, remove the "WIP" prefix from the title to allow merging.
+      When the merge request is ready, remove the "WIP" prefix from the title to allow it to be accepted.
 
   .automerge_widget.unchecked
     %p

doc/workflow/README.md

@@ -16,3 +16,4 @@
 - [Change your time zone](timezone.md)
 - [Keyboard shortcuts](shortcuts.md)
 - [Web Editor](web_editor.md)
+- ["Work In Progress" Merge Requests](wip_merge_requests.md)

doc/workflow/wip_merge_requests.md

+# "Work In Progress" Merge Requests
+
+To prevent merge requests from accidentally being accepted before they're completely ready, GitLab blocks the "Accept" button for merge requests that have been marked a **Work In Progress**.
+
+![Blocked Accept Button](wip_merge_requests/blocked_accept_button.png)
+
+To mark a merge request a Work In Progress, simply start its title with `[WIP]` or `WIP:`.
+
+![Mark as WIP](wip_merge_requests/mark_as_wip.png)
+
+To allow a Work In Progress merge request to be accepted again when it's ready, simply remove the `WIP` prefix.
+
+![Unark as WIP](wip_merge_requests/unmark_as_wip.png)