[wsrp-wsia] [change request #20] Glossary fixes: Sign-On and Sign-Off

[Rich Thompson <richt2@us.ibm.com>]

Document: WSRP spec
Section: Appendix A
Page/Line: 86/ cell 4 & cell 5
Requested by: Eric van Lydegraf
Old text: The process of presenting credentials to an authentication 
authority, establishing a simple session, and optionally establishing a 
rich session.
Proposed text: The process of destroying or invalidating the established 
security session created during a Sign-On.
 
Use definition in Sign-Off to replace Sign-On current definition ( I think 
it's clearer )
 
Reasoning: Sign-Off is wrong and between the two definitions for Sign-On I 
think the 2nd is clearer