spiceinit.xml: As a result of our test and review team, I have updated the...

spiceinit.xml: As a result of our test and review team, I have updated the documentation to match the recommendations of Laz Kestay and Ken Edmundson. Fixes #423. 

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@3410 41f8697f-d340-4b68-9986-7bafba869bb8