minor docu change

src/OpenFOAM/memory/Xfer/Xfer.H

@@ -41,7 +41,7 @@ Description
     xferMoveTo() functions can prove useful. An example is transferring
     from a DynamicList to a List.  Since the
     List\<T\>::transfer(List\<T\>&) method could result in some allocated
-    memory becoming inaccessible, the xferMoveTo() function can be used to
+    memory becoming inaccessible, the xferMoveTo() function should be used to
     invoke the correct List\<T\>::transfer(DynamicList\<T\>&) method.
 
     @code
@@ -50,6 +50,16 @@ Description
         labelList plainLst( xferMoveTo<labelList>(dynLst) );
     @endcode
 
+    Of course, since this example is a very common operation, the
+    DynamicList::xfer() method transfers to a plain List anyhow.
+    It would thus be simpler (and clearer) just to use the following code:
+
+    @code
+        DynamicList<label> dynLst;
+        ...
+        labelList plainLst(dynLst.xfer());
+    @endcode
+
 SeeAlso
     xferCopy, xferCopyTo, xferMove, xferMoveTo, xferTmp