Merge remote-tracking branch 'upstream/master' into fix-git-hooks-when-creating-file

* upstream/master:
  API: Fix groups filter
  fix: removed signed_out notification
  Fix typo in curl example request
  Fix typo
  Change docs title to represent the edition
  remove left_align setting from notification setting dropdown in favor of a pure css solution
  fix alignment for notification settings ajax response
  [ci skip] Update "Installation from source" guide for 8.15.0
  Group links spec update
  Stop replacing `$your_email` with the user's email
  Updates the font weight of button styles because of the change to system fonts
  Updated JS based on review Fixed group links dropdown to match
  Allow branch names with dots on API endpoint
  Use a single query in Projects::ProjectMembersController to fetch members
  Use gitlab-workhose 1.1.1
  Updated members dropdowns
  Use default btn styling for Housekeeping button on projects settings page
  fix display hook error message
  API: Endpoint to expose personal snippets as /snippets
  Removed leave buttons from settings dropdowns