[wsrp-wsia] [change request #47] cache key wording

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

Document: Spec
Section: 6.2.1.2
Page/Line: 40/31
Requestedby: Michael Freedman
Old text: When the MarkupParams structure supplied for generating the 
markup changes, the Consumer MUST treat the cached markup as if the 
expires duration had already elapsed. 
Proposed text: When the MarkupParams structure supplied for generating the 
markup changes, the Consumer MUST treat this as a cache miss.  It may 
choose to auto-expire the entry.
Reasoning: The old text implies only piece of content is cached per 
Portlet.  The new wording tries to avoid this