[gtk/matthiasc/for-master] Use gtk-doc from master

[Matthias Clasen <matthiasc src gnome org>]

commit 4d90259b9bfcac6f24d9168ab4b505452c7c832b
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Oct 1 15:11:37 2020 -0400

    Use gtk-doc from master
    
    I've merged the relevant parts from the gtk-doc-for-gtk4
    branch.

 subprojects/gtk-doc.wrap | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/subprojects/gtk-doc.wrap b/subprojects/gtk-doc.wrap
index 2f71008fc3..79ec37220a 100644
--- a/subprojects/gtk-doc.wrap
+++ b/subprojects/gtk-doc.wrap
@@ -1,5 +1,5 @@
 [wrap-git]
 directory=gtk-doc
 url=https://gitlab.gnome.org/GNOME/gtk-doc.git
-revision=gtk-doc-for-gtk4
+revision=master
 depth=1