Little enhancement of suEXEC docs to make sure the user knows that he can

install suEXEC via APACI but only if he is carefully and does something
explicitly (options).

Submitted by: Jason A. Dour <jason@dour.org>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@81278 13f79535-47bb-0310-9956-ffa450edef68