Reverted 'now' template tag documentation changes so it describes the real...

Reverted 'now' template tag documentation changes so it describes the real code implementation regarding (lack of) interaction with L10N machinery. Refs #15263. Thanks danielr for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15678 bcc190cf-cafb-0310-a4f2-bffc1f526a37