[glib] Document the deprecatation of G_CONST_RETURN

[Ryan Lortie <ryanl src gnome org>]

commit caa8d2ae18b16b200c7d401713733785fa818f5f
Author: Ryan Lortie <desrt desrt ca>
Date:   Sat Mar 12 22:04:53 2011 -0500

    Document the deprecatation of G_CONST_RETURN
    
    ...but don't actually deprecate it yet.

 docs/reference/glib/tmpl/macros.sgml |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/docs/reference/glib/tmpl/macros.sgml b/docs/reference/glib/tmpl/macros.sgml
index be7fc8a..33cab69 100644
--- a/docs/reference/glib/tmpl/macros.sgml
+++ b/docs/reference/glib/tmpl/macros.sgml
@@ -226,5 +226,6 @@ turn it off. This macro should only be used for return values and for
 <emphasis>in</emphasis> parameters. 
 </para>
 
-
-
+ Deprecated: 2.30: API providers should replace all existing uses with
+  <literal>const</literal> and API consumers should adjust their code
+  accordingly.