[gtk] (10 commits) ...Merge branch 'doc-fixes' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  2a92ee2... gdk: Small doc fixup (*)
  fc47e79... Document gdk_device_tool_get_axes (*)
  e07b960... a11y: Fix a few glitches in the role enum (*)
  1772d23... docs: Update private headers list (*)
  e4a3746... docs: Update the symbols list (*)
  07bf904... a11y: Document GtkATContext::state-changed (*)
  26200c0... filechooser: Document the response.activate action (*)
  d0abe5a... filter: Typo fix (*)
  3b35ae8... docs: Add a missing symbol (*)
  d40b1d3... Merge branch 'doc-fixes' into 'master'

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