[swell-foop] help: update section id to be unique

[Frederic Peters <fpeters src gnome org>]

commit 86bf56e9c30aea1481428c9cda1f4f2aa02166fd
Author: Frédéric Péters <fpeters 0d be>
Date:   Fri Sep 4 23:07:31 2015 +0200

    help: update section id to be unique

 help/C/index.docbook |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/help/C/index.docbook b/help/C/index.docbook
index d7d60fa..e264ec6 100644
--- a/help/C/index.docbook
+++ b/help/C/index.docbook
@@ -241,7 +241,7 @@
       <para>The <guimenu>Board size</guimenu> list under <menuchoice><guimenu>Swell 
Foop</guimenu><guimenuitem>Preferences</guimenuitem><guimenuitem>Setup</guimenuitem></menuchoice> contains 
three settings: <guimenuitem>Small</guimenuitem>, <guimenuitem>Medium</guimenuitem> and 
<guimenuitem>Large</guimenuitem>.</para>
     </sect2>
 
-    <sect2 id="changing-the-size">
+    <sect2 id="changing-the-number-of-objects">
       <title>Changing the Number of Objects</title>
       <para>The <guimenu>Number of colors</guimenu> option under <menuchoice><guimenu>Swell 
Foop</guimenu><guimenuitem>Preferences</guimenuitem><guimenuitem>Setup</guimenuitem></menuchoice> allows you 
to increase the number of different objects.</para>
     </sect2>