backport:

allow the space in "xy directive" (directivesynopsis heading)
to be replaced by other stuff.
Requested by Kess for German translation.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@98141 13f79535-47bb-0310-9956-ffa450edef68