Small cleanup to tutorial headings

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

diff --git a/docs/reference/gobject/tut_howto.xml b/docs/reference/gobject/tut_howto.xml
index 744552bc20848eb7b3e8be01d52bf0d26ff10136..fb52f671976869bb9ef45918ccb203edcef4282d 100644 (file)
--- 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.