Merge branch 'stable'

* stable:
  Add index link to the 2.2.2 ReleaseNotes
  Fix link and improve consistency in 'Prohibited by Gerrit' error doc
  Improve 'Push Merge Commit' access right documentation
  Access control documentation: Linkify conversion table

Change-Id: I23a7e646ef6f4a8ed21ec615576e74e49b52d2f6