Fixed ReST error in docs/contributing.txt

git-svn-id: http://code.djangoproject.com/svn/django/trunk@4421 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/contributing.txt

@@ -596,6 +596,5 @@ requests for commit access are potential flame-war starters, and will be ignored
 .. _`#django`: irc://irc.freenode.net/django
 .. _list of tickets with patches: http://code.djangoproject.com/query?status=new&status=assigned&status=reopened&has_patch=1&order=priority
 .. _PEP 8: http://www.python.org/peps/pep-0008.html
-.. _i18n documentation: http://www.djangoproject.com/documentation/i18n/
 .. _i18n branch: http://code.djangoproject.com/browser/django/branches/i18n
 .. _`tags/releases`: http://code.djangoproject.com/browser/django/tags/releases