[wss] issue 61 closure

This is a minor tweak of the changes made to draft 10 to reflect
discussion with Thomas DeMartini

Proposal: Change lines [747]-[749] of the merged draft 
http://www.oasis-open.org/committees/wss/documents/WSS-SOAPMessageSecurity-10-0223-merged.pdf
to read:
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Demonstrating knowledge of a confirmation key associated with a token
key claim supports confirming the other token claims. Knowledge of a
confirmation key may be demonstrated using a key to create an XML Signature, for example.
The relying party acceptance of the claims may depend on confidence in the token
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regards, Frederick
 
Frederick Hirsch
Nokia Mobile Phones