Add markdown support information for project settings
What does this MR do?
Following the discussion in https://gitlab.com/gitlab-org/gitlab-ce/commit/e7797b51cbad8f38a7ba974d3bfecf245aef107d#note_101407487, this will add markdown support information for project settings.
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
Tests added for this feature/bug -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides -
Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.