Fix grammatical typo in orterun man page.

This commit was SVN r23555.

orte/tools/orterun/orterun.1in

@@ -860,7 +860,7 @@ the masks 0001, 0002, 0004, and 0008.  In the second case, processes bind
 to all cores on successive sockets as indicated by the masks 000f and 00f0.
 The processes cycle through the processor sockets in a round-robin fashion
 as many times as are needed.  In the third case, the masks show us that
-2 cores have been bind per process.  In the fourth case, binding is
+2 cores have been bound per process.  In the fourth case, binding is
 turned off and no bindings are reported.
 .
 .PP