[json-glib] docs: Ignore test utilities

[Emmanuele Bassi <ebassi src gnome org>]

commit dda048522311c9f4c413090da74e5567432f88b0
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Aug 24 18:32:48 2020 +0100

    docs: Ignore test utilities

 doc/meson.build | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/doc/meson.build b/doc/meson.build
index 43e110f..edee3a4 100644
--- a/doc/meson.build
+++ b/doc/meson.build
@@ -12,6 +12,8 @@ if find_program('gtkdoc-scan', required : get_option('gtk_doc')).found()
     'json-private.h',
     'json-scanner.h',
     'json-types-private.h',
+
+    'tests/json-test-utils.h',
   ]
 
   glib_prefix = dependency('glib-2.0').get_pkgconfig_variable('prefix')