Mention the de-facto standard filename extension

GtkBuilder files are commonly named .ui - mention that in the
docs.
https://bugzilla.gnome.org/show_bug.cgi?id=590325

diff --git a/gtk/gtkbuilder.c b/gtk/gtkbuilder.c
index 9923bc257f1cbd4738e3efd5edfbf48f99311ffc..3d946053c669ad670ae417ae822b54ad83f52f50 100644 (file)
--- a/gtk/gtkbuilder.c
+++ b/gtk/gtkbuilder.c
@@ -59,7 +59,7 @@
  * or just <firstterm>UI definitions</firstterm> if the context is clear. Do not
  * confuse GtkBuilder UI Definitions with
  * <link linkend="XML-UI">GtkUIManager UI Definitions</link>, which are more
- * limited in scope.
+ * limited in scope. It is common to use <filename>.ui</filename> as the filename extension for files containing GtkBuilder UI definitions.
  * </para>
  * <programlisting>
  * <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gtk/gtkbuilder.rnc">