[retro-gtk/build-doc] ci: Fix docs to doc

[Adrien Plazas <aplazas src gnome org>]

commit 3d36df0cd6734174233eb4733cf052311463c075
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Sun Apr 12 09:36:47 2020 +0200

    ci: Fix docs to doc

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 74c5cc2..a082190 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -71,7 +71,7 @@ flatpak:demo:
 
 build-doc:
   image: debian:buster
-  stage: docs
+  stage: doc
   dependencies:
     - build-debian-gcc
   script: