[gi-docgen] (4 commits) ...Merge branch 'issue-117' into 'main'

[Emmanuele Bassi <ebassi src gnome org>]

Summary of changes:

  7dc7916... generate: Improve classification of pointer arguments (*)
  1f38411... template: Don't check for pointer when nullables will do (*)
  b125b0f... template: Check for nullable in-out arguments (*)
  2afe0af... Merge branch 'issue-117' into 'main'

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