[glib] Small cleanup to tutorial headings

[Matthias Clasen <matthiasc src gnome org>]

commit d59acb701e8ab80f51f19dc9ec9d5145fc4fc2e7
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Mar 17 23:01:21 2013 -0400

    Small cleanup to tutorial headings
    
    This makes all the subsection headers consistent.
    https://bugzilla.gnome.org/show_bug.cgi?id=659428

 docs/reference/gobject/tut_howto.xml |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/docs/reference/gobject/tut_howto.xml b/docs/reference/gobject/tut_howto.xml
index 744552b..fb52f67 100644
--- a/docs/reference/gobject/tut_howto.xml
+++ b/docs/reference/gobject/tut_howto.xml
@@ -794,7 +794,7 @@ b_method_to_call (B *obj, int a)
   <title>How to define and implement interfaces</title>
 
   <sect1 id="howto-interface-define">
-    <title>How to define an interface</title>
+    <title>Defining interfaces</title>
   
   <para>
     The bulk of interface definition has already been shown in <xref 
linkend="gtype-non-instantiable-classed"/>
@@ -901,7 +901,7 @@ maman_ibaz_do_something (MamanIbaz *self)
   </sect1>
   
   <sect1 id="howto-interface-implement">
-    <title>How to implement an interface</title>
+    <title>Implementing interfaces</title>
   
     <para>
       Once the interface is defined, implementing it is rather trivial.