Add a link to Gerrit's project to the top of gerrit-cherry-pick

Helps to identify where the script came from, if someone has it and
is wondering what the hell it is.

Change-Id: I9d3d1bf4c3321a5e86a1c48e09643edcdb21b372
Signed-off-by: Shawn O. Pearce <sop@google.com>

src/main/java/com/google/gerrit/server/ssh/scproot/bin/gerrit-cherry-pick

@@ -1,5 +1,7 @@
 #!/bin/sh
 #
+# Part of Gerrit Code Review (http://code.google.com/p/gerrit/)
+#
 # Copyright (C) 2009 The Android Open Source Project
 # 
 # Licensed under the Apache License, Version 2.0 (the "License");