git-p4: correct --prepare-p4-only instructions

If you use git-p4 with the "--prepare-p4-only" option, then
it prints the p4 command line to use. However, the command
line was incorrect: the changelist specification must be
supplied on standard input, not as an argument to p4.

Signed-off-by: Luke Diamand <[email protected]>
Acked-by: Pete Wyckoff <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: luked99

git-p4.py

@@ -1442,7 +1442,7 @@ def applyCommit(self, id):
             print "  " + self.clientPath
             print
             print "To submit, use \"p4 submit\" to write a new description,"
-            print "or \"p4 submit -i %s\" to use the one prepared by" \
+            print "or \"p4 submit -i <%s\" to use the one prepared by" \
                   " \"git p4\"." % fileName
             print "You can delete the file \"%s\" when finished." % fileName