[gedit] build: set gtk_doc option to true as its default value

[Sébastien Wilmet <swilmet src gnome org>]

commit f20c462777f5345b8aa99b02c27aa4d49c474853
Author: Sébastien Wilmet <swilmet informatique-libre be>
Date:   Fri Apr 22 13:26:24 2022 +0200

    build: set gtk_doc option to true as its default value
    
    The default values in meson_options.txt are tuned for Linux
    distributors.
    
    And I recommend Linux packagers to build the gtk-doc of gedit, so that
    it's easier for plugin developers to install e.g. a -devel package,
    launch Devhelp and access the API docs.

 meson_options.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson_options.txt b/meson_options.txt
index 4e842d1ea..a97514f78 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -1,6 +1,6 @@
 option(
   'gtk_doc',
-  type: 'boolean', value: false,
+  type: 'boolean', value: true,
   description: 'Build API reference for plugins (requires gtk-doc)'
 )