[libadwaita] (7 commits) Non-fast-forward update to branch wip/cdavis/prefs-group-buildable-docs

[Alexander Mikhaylenko <alexm src gnome org>]

The branch 'wip/cdavis/prefs-group-buildable-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:

  2ff41aa... preferencesgroup: Document GtkBuildable behavior

Commits added to the branch:

  cb3bca3... demo: Add a caption to the screenshot (*)
  5055149... view-switcher: Clarify docs (*)
  83d4f77... doc: Add a Styles & Appearance page (*)
  cbea153... doc: Add Boxed Lists page (*)
  a9b65e6... doc: Add Adaptive Layouts page (*)
  771ea64... header-bar: Avoid ... in xml examples (*)
  5f66934... preferencesgroup: Document GtkBuildable behavior

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