[mutter] (3 commits) Non-fast-forward update to branch wip/nielsdg/add-docs

[Niels De Graef <nielsdg src gnome org>]

The branch 'wip/nielsdg/add-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:

  632c08a... WIP: add some gtk-doc comments.

Commits added to the branch:

  71a62bb... constraints: Make current placement rule stack allocated (*)
  8200995... shaped-texture: Clean up texture regions (*)
  eb5c43f... Add some gtk-doc comments.

(*) This commit already existed in another branch; no separate mail sent