Fix link to the refactoring page in the table of contents

Issue-Ref: 3948
Issue-Url: https://af3-developer.fortiss.org/issues/3948



Signed-off-by: Tiziano Munaro <munaro@fortiss.org>

org.fortiss.af3.rcp.help/toc.xml

@@ -57,7 +57,7 @@
     	</topic-->
     	<topic href="html/library.html" label="Libraries">
     	</topic> 
-    	<topic href="html/refactorying.html" label="Refactoring">
+    	<topic href="html/refactoring.html" label="Refactoring">
     	</topic>
 	</topic> 
 	<topic label="Deployment and Code generation">