[mutter] (3 commits) Non-fast-forward update to branch bilelmoussaoui/clutter-docs

[Marge Bot <marge-bot src gnome org>]

The branch 'bilelmoussaoui/clutter-docs' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  f7cf106... clutter: Migrate to gi-docgen
  e963892... cally: Migrate to gi-docgen
  4d85480... clutter: Remove all the since annotations

Commits added to the branch:

  c8e6386... clutter: Migrate to gi-docgen
  7b7e1c6... cally: Migrate to gi-docgen
  a73ae93... clutter: Remove all the since annotations