Remove some directive docs from mpm_netware and point them at mpm_common, plus

Remove some directive docs from mpm_netware and point them at mpm_common, plus
update the mpm_common docs to deal with multiple meanings for the same directives.

In the future, it would be a wise idea not to use the same directive name as
another MPM unless the directive really does exactly the same thing in both
MPMs.

Problem pointed out by: Rich Bowen

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@95663 13f79535-47bb-0310-9956-ffa450edef68