Remove empty CodeBlockConfig elements. These elements are not
providing any benefit for the enclosed code blocks. This PR removes
the elements so so that the source is easier to read.
/docs/security/acl/acl-system was renamed in e9a42df from PR #12460 to
/docs/security/acl. A corresponding redirect was not added for this
page, resulting in a 404 being returned when accessing the old URL
path.
This commit redirects the former URL path to the new location, and
also updates all links on the site to point to the new location.
Blake Covarrubias