[releng] 3.33.4: downgrade gtk-doc

[Michael Catanzaro <mcatanzaro src gnome org>]

commit e5a932579b65e34880882a073f56235ed90f8f45
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Tue Jul 23 10:59:44 2019 -0500

    3.33.4: downgrade gtk-doc

 tools/versions | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/tools/versions b/tools/versions
index 53c599c..4e59449 100644
--- a/tools/versions
+++ b/tools/versions
@@ -78,7 +78,7 @@ core:gspell:1.8.1:
 core:gssdp:1.2.1:
 core:gtk:3.96.0:
 core:gtk+:3.24.10:
-core:gtk-doc:1.30:
+core:gtk-doc:1.29:
 core:gtk-vnc:0.9.0:
 core:gtkmm:3.95.1:
 core:gtkmm:3.24.1: