Merge r1226477 from trunk:

add/enhance some hints about configuration section merging (or lack of it in
the case of mod_access_compat)
PR52406




git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1226481 13f79535-47bb-0310-9956-ffa450edef68