Update docs for git usage

scm.py

 # Copyright (c) 2006-2009 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.
 
 """SCM-specific utility classes."""
 
 import glob
 import os
 import re
 import shutil
@@ skipping 83 matching lines @@
                          print_messages,
                          print_stdout,
                          filter):
     """Runs a command, optionally outputting to stdout.
 
     stdout is passed line-by-line to the given filter function. If
     print_stdout is true, it is also printed to sys.stdout as in Run.
 
     Args:
       args: A sequence of command line parameters to be passed.
-      in_directory: The directory where svn is to be run.
+      in_directory: The directory where git is to be run.
       print_messages: Whether to print status messages to stdout about
         which commands are being run.
       print_stdout: Whether to forward program's output to stdout.
       filter: A function taking one argument (a string) which will be
         passed each line (with the ending newline character removed) of
         program's output for filtering.
 
     Raises:
       gclient_utils.Error: An error occurred while running the command.
     """
@@ skipping 620 matching lines @@
     if not cur_dir_repo_root:
       return None
 
     while True:
       parent = os.path.dirname(directory)
       if (SVN.CaptureInfo(parent, print_error=False).get(
               "Repository Root") != cur_dir_repo_root):
         break
       directory = parent
     return GetCasedPath(directory)