Remove duplicate &Methods; in exception skeleton (#276)

The classsynopsisinfo Methods header appeared twice in
exceptionname.xml, unlike classname.xml which has it once.

Author: lacatoire

skeletons/exceptionname.xml

@@ -30,7 +30,6 @@
     </ooclass>
 
     <!-- Edit the classname below -->
-    <classsynopsisinfo role="comment">&Methods;</classsynopsisinfo>
     <!-- If has a constructor -->
     <classsynopsisinfo role="comment">&Methods;</classsynopsisinfo>
     <xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.exceptionname')/db:refentry/db:refsect1[@role='description']/descendant::db:constructorsynopsis[@role='ExceptionName'])">