Update CONTRIBUTING to reflect our switch to git on gerrit.

commit fee6f80fb8bca110a03fc7693a17f4c5e4b798d2
Author: Marcin Bukat <marcin.bukat <at> gmail.com>
Date:   Tue Jan 24 13:05:25 2012 +0100

    Update CONTRIBUTING to reflect our switch to git on gerrit.

    Fixes FS#12536

    Change-Id: Iee4700ef01eb23c92a026df5074ffcf0257fe0ec

diff --git a/docs/CONTRIBUTING b/docs/CONTRIBUTING
index 83f0aa6..f31b1a8 100644
--- a/docs/CONTRIBUTING
+++ b/docs/CONTRIBUTING
 <at>  <at>  -1,5 +1,3  <at>  <at> 
-$Id$
-
                __________               __   ___.
      Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
      Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 <at>  <at>  -55,7 +53,7  <at>  <at>  Braces for function declarations are put in a new line under the name, as in:
   }

 Always indent your code with four spaces. Don't use TAB characters, as that
-will mess up code display in CVS, printing, and a zillion other places.
+will mess up code display, printing, and a zillion other places.

 Keep lines below 80 columns length. Use whitespace and newlines to make the
 code easy to browse/read.
 <at>  <at>  -67,16 +65,18  <at>  <at>  Use "unix style" line feeds: "LF" only. Do not use "CR+LF".