Update SUMMARY.md

Author: mattqual

src/SUMMARY.md

@@ -2,14 +2,14 @@
 
 - [Overview](./overview.md)
   - [Embedding resources](./overview/embedding-resources.md)
-  - [XML capabilities](./overview/xml-capabilities.md)
-    - [Whack XML capabilities](./overview/xml-capabilities/whack.md)
   - [Relation to other technologies](./overview/relation.md)
     - [MXML](./overview/relation/mxml.md)
     - [React.js](./overview/relation/reactjs.md)
     - [ActionScript 3](./overview/relation/as3.md)
     - [JavaScript](./overview/relation/javascript.md)
     - [Java](./overview/relation/java.md)
+  - [XML capabilities](./overview/xml-capabilities.md)
+    - [Whack XML capabilities](./overview/xml-capabilities/whack.md)
   - [Access control namespaces](./overview/access-control.md)
   - [Meta-data](./overview/metadata.md)
   - [Generics](./overview/generics.md)