Improve specs output readability by replacing
`it_behaves_like` with `include_examples`
in `BeSuccessMatcher`

Former shared examples were used only once.
Inlining them makes tests more clear.

Use Rubocop's Include
instead of manually checking the matcher in controllers specs.

BeSuccessMatcher now supports following examples:

```
expect(response).to be_success
expect(response).to_not be_success
expect(response).not_to be_success

is_expected.to be_success
is_expected.to_not be_success
is_expected.not_to be_success
```

Prevent using `be_success` call in controller specs to avoid
getting following deprecation warning:

```
DEPRECATION WARNING: The success? predicate is deprecated and
will be removed in Rails 6.0.
Please use successful? as provided by Rack::Response::Helpers.
```

Edit Feature Flags topic

See merge request gitlab-org/gitlab-ce!31956

Fix markdown in various docs (part 1)

See merge request gitlab-org/gitlab-ce!32267

Clean up issues that may cause the docs-lint
test to fail, such as trailing whitespace, no
EOF newline, blockquotes, etc

Fixes Introduced in text for our renderer

See merge request gitlab-org/gitlab-ce!32308

Note CI token exception to JWT requests in rate limit docs

See merge request gitlab-org/gitlab-ce!32168

Add Issue and Merge Request titles to Todo items

Closes #63488

See merge request gitlab-org/gitlab-ce!30435

CE Backport of EE changes

See merge request gitlab-org/gitlab-ce!32203

Remove eks from adding an existing cluster section

See merge request gitlab-org/gitlab-ce!32125

Ss/add board name to page title

See merge request gitlab-org/gitlab-ce!32074

Resolving minor formatting issues in gitlab-basics

Closes #65307

See merge request gitlab-org/gitlab-ce!32194

Rename dev, org, com helper

See merge request gitlab-org/gitlab-ce!32115

Only displays the todo body if the todo has a note.
This is to avoid redundant Issue or Merge Request titles
displayed both in the Todo title and body.

Update group permissions table documentation

See merge request gitlab-org/gitlab-ce!32020

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/66091

Closes #66091

See merge request gitlab-org/gitlab-ce!32188

Changed reference to Mattermost versions, so that it's clear which
menu navigation path applies.

Add docs for db_load_balancing metrics

See merge request gitlab-org/gitlab-ce!32044

Add QA specs for using IP rate limits

See merge request gitlab-org/gitlab-ce!32177

Document setting admin credentials in QA tests

See merge request gitlab-org/gitlab-ce!32271

CE backport for gitlab-org/gitlab-ee!15433 (Expose DesignType#notes_count in GraphQL)

See merge request gitlab-org/gitlab-ce!32037

Notes call `#after_note_created` and `#after_note_destroyed` on their
noteable in callbacks, so the noteable can perform tasks particular to
them, like cache expiry.

This is in preparation of the EE-specific class
`DesignManagement::Design` clearing its `user_notes_count` cache when
its note are created or destroyed.

Refactoring Rspec behaviour testing of a counter caching service into a
shared example.

https://gitlab.com/gitlab-org/gitlab-ee/issues/13353

Remove trailing whitespace from project snippets API docs

Closes #66677

See merge request gitlab-org/gitlab-ce!32298

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/66677