Apply suggestions from code review

Use sect2

Co-authored-by: Louis-Arnaud <la.catoire@gmail.com>

Author: Crell

language/control-structures/switch.xml

@@ -294,7 +294,7 @@ switch($beer)
  </para>
 
 
- <section role="changelog">
+ <sect2 role="changelog">
   &reftitle.changelog;
   <informaltable>
    <tgroup cols="2">
@@ -314,7 +314,7 @@ switch($beer)
     </tbody>
    </tgroup>
   </informaltable>
- </section>
+ </sect2>
 
  <sect2 role="seealso">
   &reftitle.seealso;