Explain the docs' CD, relating to the milestone the doc is set to vs online docs

See merge request gitlab-org/gitlab-ce!21737

Correct Gitaly config typo in update guides

See merge request gitlab-org/gitlab-ce!21821

Fix link to blog posts in docs

See merge request gitlab-org/gitlab-ce!21820

The 9.4 to 9.5 and 9.5 to 10.0 guides missed a closing backtick. This
was corrected in the 10.0 to 10.1 guide, from which subsequent guides
were written without the error.

Due to a missing `s`, a link to the blog archive
for releases was broken.

Delete container repository tags outside of transaction

Closes #51380

See merge request gitlab-org/gitlab-ce!21679

Fix rubocop Style/ZeroLengthPredicate

See merge request gitlab-org/gitlab-ce!21793

Relax the subject line requirements for commits

Closes gitlab-org/release/framework#16

See merge request gitlab-org/gitlab-ce!21811

Re-enable legacy diff notes on merge request diffs

Closes #48873

See merge request gitlab-org/gitlab-ce!21652

Remove unused constant

See merge request gitlab-org/gitlab-ce!21810

This changes the hard limit of 50 to a soft limit of 50, with the new
hard limit being 72 characters. This gives people a bit more space,
while still (hopefully) guiding them towards subject lines that are
roughly 50 characters long.

Fixes https://gitlab.com/gitlab-org/release/framework/issues/16

Fix grammar in runner-related specs, views and localisations.

See merge request gitlab-org/gitlab-ce!21691

This removes an unused constant from the
`RubyInterpolationInTranslation`. The constant was used in a first
implementation of this class.

See merge request gitlab-org/gitlab-ce!21689

Use standalone diff stats RPC on every comparison view

Closes #51477, #20282, and #49399

See merge request gitlab-org/gitlab-ce!21778

When there are many tags in a container repository, deleting them
can exceed the default 60 second idle-in-transaction timeout in
Sidekiq. We now explicitly delete them in the DestroyService
before destroying the model.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/51380

Refactor main.js content

See merge request gitlab-org/gitlab-ce!19783

Unite green buttons under one css class

See merge request gitlab-org/gitlab-ce!21795

Re-enables merge conflicts resolution spec

See merge request gitlab-org/gitlab-ce!21654

Rename btn-new, btn-create and btn-save to btn-success
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Vendor Auto-DevOps.gitlab-ci from gitlab-ci-yml

See merge request gitlab-org/gitlab-ce!21775

Add wrapper rake task to migrate all uploads to OS

Closes #51571

See merge request gitlab-org/gitlab-ce!21779

Remove EE-specific lines from Plan concerns

See merge request gitlab-org/gitlab-ce!21448

Enhance some performance guideline titles

See merge request gitlab-org/gitlab-ce!21797

[QA] consolidate selector patterns (1_manage/login)

See merge request gitlab-org/gitlab-ce!21711

Improve Emoji detection in commit messages

Closes gitlab-org/release/framework#15

See merge request gitlab-org/gitlab-ce!21799

Resolve "Enable Auto DevOps by default for self managed instances of GitLab"

Closes #41729

See merge request gitlab-org/gitlab-ce!21157

Improve cluster apps installation flow

Closes #50111

See merge request gitlab-org/gitlab-ce!21567

Improve TabHelper to clarify the use of Namespaces for the nav_link

See merge request gitlab-org/gitlab-ce!21787