So that a command like
 "git config rietveld.viewvc-url http://src.chromium.org/viewvc/chrome?view=rev&revision="
works fine.

Fix the description automatically generated for the hooks to be using the same
code than for the one presented to the user.

R=cmp@chromium.org
BUG=
TEST=Tested manually on cygwin, win32, linux


Review URL: https://chromiumcodereview.appspot.com/10447021

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@138874 0039d316-1c4b-4281-b951-d872f2087c98