Add "API" to all API docs
Follows: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11261, in which we added "API" to some doc headings as a test. Looks like it worked.
For instance, I searched for keys
in the docs:
On the 1st set of docs (EE), you see the fist result listed "Keys" links to the doc on keys' API, giving a false impression that the doc is on "Keys documentation". On the 2nd set (CE), you clearly identify that the same doc is on keys' API indeed.
cc/ @axil @seanpackham