Address comments from CL 125123002 and additional cleanup.

dart/site/try/deploy.sh

Index: dart/site/try/deploy.sh
diff --git a/dart/site/try/deploy.sh b/dart/site/try/deploy.sh
index 9e7145a0dcf4a32e59a0e3f4ead6fa0fbd7206f7..1f57c1b3bb9f6c439c75d5669fab4140039584c6 100644
--- a/dart/site/try/deploy.sh
+++ b/dart/site/try/deploy.sh
@@ -1,3 +1,15 @@
+#!/bin/bash
+# Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+# Deploy step for try.dartlang.org. Usage:
+#
+#   bash deploy.sh OLD NEW
+#
+# Where OLD and NEW are unique prefixes, for example, a short git commit hash.
+# OLD is the existing prefix that should be replaced by NEW.
+
 old=$1
 new=$2
 echo git checkout-index -a -f --prefix=$new/