Square and Angle bracket use causes kramdown warnings,
so changed or enclosed in backticks as needed

Update capitalization in /administration, /api, /ci
and /customization

This functionality is available in the /autocomplete users pseudo-API.
We're attempting to replace that with the canonical API, so it needs
support for this parameter too.

Expose time since starring on project/:id/starrers API endpoint; exclude private profiles here as well

Currently, the project visibility methods attribute description link to
the descriptions and options for visibility methods. The merge methods
attribute description doesn't should do the same.

Previously, we used brackets to denote the tier badges,
but this made Kramdown, the docs site Markdown renderer,
show many warnings when building the site. This is now
fixed by using parentheses instead of square brackets.

This was caused by [PREMIUM] looking like a link to
Kramdown, which couldn't find a URL there.

See:
- https://gitlab.com/gitlab-com/gitlab-docs/merge_requests/484
- https://gitlab.com/gitlab-org/gitlab-ce/issues/63800

Many small fixes to api docs which were merged from EE to CE,
and tables cleaned up, as noted in issue
https://gitlab.com/gitlab-org/gitlab-ce/issues/64072

The auto_devops object sometimes doesn't exists. We may need to create
it.

We map the boolean to the string 'fetch' or 'clone', to be more
explicit.

- issues_access_level
- repository_access_level
- merge_requests_access_level
- builds_access_level
- wiki_access_level
- snippets_access_level

Squashing a few commits and continuing work
on merging the 12 api docs that have not
been ported to CE yet.

Enable Get and Update of ci_default_git_depth for
Project API.

Renaming Project#default_git_depth to :ci_default_git_depth
to give more context through the API usage.

Add API documentation

- Namespace now return avatar_url and web_url
- NamespaceBasic entity was modified to include avatar_url and web_url,
information is fetched differently depending if the Namespace is a user
or a group

Includes documentation changes

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/39858