[gxml] CI: fix pages generation

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit f062e524df2a4bdd15cbcf9b00afa55684ce4428
Author: Daniel Espinosa <esodan gmail com>
Date:   Fri Jul 5 10:01:12 2019 -0500

    CI: fix pages generation

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2e152fe..fd1716d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -32,7 +32,7 @@ build:
 pages:
   stage: deploy
   script:
-  - meson _build -Ddisable-valadocs=false
+  - meson _build -Ddisable-docs=false
   - cd _build
   - ninja
   - mv docs/GXml-* ../public