[1.3.X] Fixed #15681 -- Fixed a documentation error regarding the default...

[1.3.X] Fixed #15681 -- Fixed a documentation error regarding the default value of the STATIC_URL setting. Thanks, Chris Drackett.

Backport from trunk (r15913 and r15914).

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.3.X@15966 bcc190cf-cafb-0310-a4f2-bffc1f526a37