Fix git help on 32-bit Windows

bootstrap/win/win_tools.bat

 @echo off
 :: Copyright (c) 2012 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.
 
 :: This script will determine if python, git, or svn binaries need updates.  It
 :: returns 123 if the user's shell must restart, otherwise !0 is failure
 
 :: Sadly, we can't use SETLOCAL here otherwise it ERRORLEVEL is not correctly
 :: returned.
@@ skipping 138 matching lines @@
 
 :SYNC_GIT_HELP_FILES
 :: Copy all the depot_tools docs into the mingw64 git docs root.
 :: /i : Make sure xcopy knows that the destination names a folder, not a file
 :: /q : Make xcopy quiet (though it still prints a `X File(s) copied` message
 ::      which is why we have the > NUL)
 :: /d : Copy source files that are newer than the corresponding destination
 ::      files only. This prevents excessive copying when none of the docs
 ::      actually changed.
 :: /y : Don't prompt for overwrites (yes)
-xcopy /i /q /d /y "%WIN_TOOLS_ROOT_DIR%\man\html\*" "%GIT_INST_DIR%\mingw64\share\doc\git-doc" > NUL
+xcopy /i /q /d /y "%WIN_TOOLS_ROOT_DIR%\man\html\*" "%GIT_INST_DIR%\mingw%OS_BITS%\share\doc\git-doc" > NUL
 
 :: MSYS users need to restart their shell.
 if defined MSYSTEM if defined DID_UPGRADE (
   echo.
   echo.
   echo IMPORTANT:
   echo depot_tools' git distribution has been updated while inside of a MinGW
   echo shell. In order to complete the upgrade, please exit the shell and re-run
   echo `git bash` from cmd.
   exit 123
@@ skipping 45 matching lines @@
 goto :END
 
 
 :returncode
 set WIN_TOOLS_ROOT_URL=
 set WIN_TOOLS_ROOT_DIR=
 exit /b %ERRORLEVEL%
 
 :END
 call :returncode %ERRORLEVEL%