qmos.xml: Improved documentation in preparation for the October release....

qmos.xml: Improved documentation in preparation for the October release. Working with me to help figure out the best ways to document qmos were Orrin Thomas and Trent Hare. Fixes #427 

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@3413 41f8697f-d340-4b68-9986-7bafba869bb8