Replaced some <a href> tags with <module> directives.

<usage>

<p>Specify a user id and group id for a specific child process. The number of

children if set by the <a href="mpm_common.html#numservers">NumServers</a>

directive. For example, the default value for <a

href="mpm_common.html#numservers">NumServers</a> is 5 and that means

children is set by the <directive module="mpm_common">NumServers</directive>

directive. For example, the default value for <directive

module="mpm_common">NumServers</directive> is 5 and that means

children ids 1,2,3,4 and 5 are available for assigment. If a child does not

have an associated ChildPerUserID, it inherits the <a

href="mpm_common.html#user">User</a> and <a

href="mpm_common.html#group">Group</a> settings from the main server </p> 

have an associated ChildPerUserID, it inherits the <directive

module="mpm_common">User</directive> and <directive

module="mpm_common">Group</directive> settings from the main server </p> 

</usage>

</directivesynopsis>