[gtksourceview] region: document the property

[Sébastien Wilmet <swilmet src gnome org>]

commit 036037edaab8a3fcd5b522365592b3612fa700e2
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sun Apr 3 11:46:55 2016 +0200

    region: document the property
    
    Forgot it.

 gtksourceview/gtksourceregion.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/gtksourceview/gtksourceregion.c b/gtksourceview/gtksourceregion.c
index 2694116..f2ae41e 100644
--- a/gtksourceview/gtksourceregion.c
+++ b/gtksourceview/gtksourceregion.c
@@ -251,6 +251,14 @@ gtk_source_region_class_init (GtkSourceRegionClass *klass)
        object_class->set_property = gtk_source_region_set_property;
        object_class->dispose = gtk_source_region_dispose;
 
+       /**
+        * GtkSourceRegion:buffer:
+        *
+        * The #GtkTextBuffer. The #GtkSourceRegion has a weak reference to the
+        * buffer.
+        *
+        * Since: 3.22
+        */
        properties[PROP_BUFFER] =
                g_param_spec_object ("buffer",
                                     "Buffer",