doxygen layout: make sure wasm goes to top

doc/DoxygenLayout.xml

@@ -47,6 +47,7 @@
   <class>
     <briefdescription visible="yes"/>
     <includes visible="$SHOW_HEADERFILE"/>
+    <detaileddescription title=""/>
     <inheritancegraph visible="$CLASS_GRAPH"/>
     <collaborationgraph visible="yes"/>
     <memberdecl>
@@ -83,7 +84,6 @@
       <related title="" subtitle=""/>
       <membergroups visible="yes"/>
     </memberdecl>
-    <detaileddescription title=""/>
     <memberdef>
       <inlineclasses title=""/>
       <typedefs title=""/>