[wsrp-wsia] [change request #56] Key length justification

Document: Spec
Section: 6.1.1
Page/Line: 30/34
Requested by: Michael Freedman
Old text: Since this reference may be used as such a key, its length MUST 
be less than 256 bytes and Consumer SHOULD keep it as short as possible.
Proposed text: Since this reference may be used as a key, its length MUST 
be less than 256 bytes. Consumer SHOULD keep it as short as possible.
Reasoning: I like it better ;-)