some comments updated

[[Imported from SVN: r2966]]

grid/common/intersectioniterator.hh

@@ -218,7 +218,7 @@ namespace Dune
       asImp().increment();
     }
 
-    //! return true if intersection is with boundary. \todo connection with boundary information, processor/outer boundary
+    //! return true if this intersection is with boundary. \todo connection with boundary information, processor/outer boundary
     bool boundary () const
     {
       return asImp().boundary();
@@ -228,7 +228,7 @@ namespace Dune
       return asImp().boundaryEntity();
     }
 
-    //! return true if intersection is with neighbor on this level.
+    //! return true if intersection is with another element (might be on a lower level).
     bool neighbor () const
     {
       return asImp().neighbor();