Removed a confusing comment.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%402852

examples/pipe_ex_2.cpp

@@ -80,9 +80,6 @@ public:
     }
 
     // Here we declare our pipe object.  It will contain our messages.
-    // There are only two requirements on the type of objects you can use in a
-    // pipe, first they must have a default constructor and second they must
-    // be swappable by a global swap().
     pipe_type message_pipe;