Fixed reference to "Editing statecharts" chapter.

plugins/org.yakindu.sct.doc.user/plugin.xml

@@ -10,7 +10,7 @@
         <toc file="help/Part2-User-Guide/30_statechart_language-toc.xml" primary="false" />
         <toc file="help/Part2-User-Guide/60_generating_code-toc.xml" primary="false" />
         <toc file="help/Part2-User-Guide/10_overview-toc.xml" primary="false" />
-        <toc file="help/Part2-User-Guide/40_editing statecharts-toc.xml" primary="false" />
+        <toc file="help/Part2-User-Guide/40_editing_statecharts-toc.xml" primary="false" />
     </extension>
 
     <extension point="org.eclipse.help.contexts">

plugins/org.yakindu.sct.doc.user/toc.xml

@@ -9,7 +9,7 @@
       <link toc="help/Part2-User-Guide/10_overview-toc.xml"/>
       <link toc="help/Part2-User-Guide/20_tutorial-toc.xml"/>
       <link toc="help/Part2-User-Guide/30_statechart_language-toc.xml"/>
-      <link toc="help/Part2-User-Guide/40_editing statecharts-toc.xml"/>
+      <link toc="help/Part2-User-Guide/40_editing_statecharts-toc.xml"/>
       <link toc="help/Part2-User-Guide/50_simulating_statecharts-toc.xml"/>
       <link toc="help/Part2-User-Guide/60_generating_code-toc.xml"/>
    </topic>