[gtk] (27 commits) ...Merge branch 'matthiasc/for-master' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  0996552... demos: Clean up doc comments (*)
  2d0957b... docs: Clean up docs syntax (*)
  fff2b3c... gdk: Clean up docs syntax (*)
  2d266d1... gsk: Clean up docs syntax (*)
  91f7b96... gtk: Clean up docs syntax (*)
  fc9f580... docs: Update GSK_RENDERER docs (*)
  0bba361... docs: Avoid stairstepping (*)
  252edbd... docs: Fix a typo (*)
  b617ba1... docs: Refer to backend APIs (*)
  786e28f... filter: Cosmetic docs changes (*)
  8761048... sorter: Cosmetic docs changes (*)
  9a7e4f4... eventcontroller: Cosmetic docs changes (*)
  2d12a7d... directorylist: Cosmetic docs changes (*)
  6cb4dda... gdk: Cosmetic docs changes (*)
  b35e02d... shortcutscontroller: Cosmetic docs changes (*)
  13a9348... widget: Cosmetic docs changes (*)
  3ab34ff... text: Cosmetic docs fixes (*)
  74a39bb... textview: Cosmetic docs changes (*)
  f5f8f83... textbuffer: Cosmetic docs changes (*)
  09244ed... expression: Cosmetic docs changes (*)
  fe56431... sortlistmodel: Cosmetic docs changes (*)
  601a8de... treemodel: Cosmetic docs changes (*)
  40f292c... docs: Sync up debug flag information (*)
  8bcc6b1... docs: Fix up syntax (*)
  71aac48... docs: More syntax fixes (*)
  be94405... docs: More syntax fixes (*)
  226edf1... Merge branch 'matthiasc/for-master' into 'master'

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