Remove useless <br \> in highlight blocks.

(r1741841 in 2.4.x + small tweak for logs.xml because quoting is different. This will be fixed later on)

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1741842 13f79535-47bb-0310-9956-ffa450edef68