CTR: docs
Merged revision 1456713 from tomcat/trunk:
Better introduction of the Manager web application.
Added mention of Tomcat Maven Plugin project.


git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc6.0.x/trunk@1457366 13f79535-47bb-0310-9956-ffa450edef68
CTR: docs
Replace <tt> by <code> in docs.
It is backport of r1145137. In TC6 only valve.xml file had this issue.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc6.0.x/trunk@1457368 13f79535-47bb-0310-9956-ffa450edef68