Minor gramatical nit found by Karen/Sun.

This commit was SVN r14622.

orte/tools/orterun/orterun.1

@@ -577,7 +577,7 @@ the invocation of \fImpirun\fP.
 .SS Current Working Directory
 .
 The \fI\-wdir\fP mpirun option (and its synonym, \fI\-wd\fP) allows
-the user to change to an arbitrary directory before their program is
+the user to change to an arbitrary directory before the program is
 invoked.  It can also be used in application context files to specify
 working directories on specific nodes and/or for specific
 applications.