Add --wait-for-debugger to devtools' documentation

mojo/devtools/common/mojo_run

 #!/usr/bin/env python
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import argparse
 import logging
 import sys
 
 from devtoolslib import paths
 from devtoolslib import shell_arguments
 
 _USAGE = ("mojo_run "
          "[--args-for=<mojo-app>] "
          "[--content-handlers=<handlers>] "
          "[--enable-external-applications] "
          "[--disable-cache] "
          "[--enable-multiprocess] "
-         "[<mojo-app>] "
+         "[--wait-for-debugger] "
+         "[--sky <mojo-app>|<mojo-app>] "
          """
 
 A <mojo-app> is a Mojo URL or a Mojo URL and arguments within quotes.
 Example: mojo_run "mojo:js_standalone test.js".
 <url-lib-path> is searched for shared libraries named by mojo URLs.
 The value of <handlers> is a comma separated list like:
 text/html,mojo:html_viewer,application/javascript,mojo:js_content_handler
 """)
 
 _DESCRIPTION = """Runner for Mojo applications.
@@ skipping 91 matching lines @@
 
   if script_args.verbose:
     print "Shell arguments: " + str(shell_args)
 
   shell.Run(shell_args)
   return 0
 
 
 if __name__ == "__main__":
   sys.exit(main())