Merge r1638072 from trunk:

mod_auth_basic: Fix comment mentioning 403 instead of 401.

Submitted by: jkaluza
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1642850 13f79535-47bb-0310-9956-ffa450edef68