Improve documentation of the Manager application:
Swap "Using JMXProxy" and "Ant" sections. No change in the text of the sections themselves.

Backport of r1641725 from Tomcat 8.


git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1642043 13f79535-47bb-0310-9956-ffa450edef68