Remove a useless compatibility note.

It is already stated at the very begining of the page.

Add a missing ')' to ease reading

(r1852223 in trunk)

+ synch with trunk

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1852224 13f79535-47bb-0310-9956-ffa450edef68