CTR: docs
Add RemoteAddrValve to Manager configuration examples.
It is backport of r1456721



git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc6.0.x/trunk@1457227 13f79535-47bb-0310-9956-ffa450edef68
CTR: xml comment
Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=22278
Add commented out sample configuration of RemoteAddrValve to Manager and Host Manager applications.

(Copying the current text from TC7.
Initially introduced in r1060627 based on patch by Yann Cébron and improved later).

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc6.0.x/trunk@1457228 13f79535-47bb-0310-9956-ffa450edef68