[gnome-builder] build: disable api docs by default

[Christian Hergert <chergert src gnome org>]

commit 4f77f0e616cc66245c0159ead7342fb5c7763bc4
Author: Christian Hergert <chergert redhat com>
Date:   Sun Nov 12 01:20:23 2017 -0800

    build: disable api docs by default

 meson_options.txt |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/meson_options.txt b/meson_options.txt
index 6687c22..34cba80 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -12,7 +12,7 @@ option('with_editorconfig', type: 'boolean')
 option('with_webkit', type: 'boolean')
 option('with_vapi', type: 'boolean')
 option('with_help', type: 'boolean')
-option('with_docs', type: 'boolean')
+option('with_docs', type: 'boolean', value: false)
 
 # Plugins
 # Ideally we want many of these to be defined in the plugin dir: