[wsrp] [CR312] - Clarify InvalidSession fault description

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

Document: Specification
Requested by: Subbu Allamaraju
Section: Section 13
Page: 76
Old Text:

InvalidSession: Used only when a Producer
session has timed out AND the 
Producer needs the Consumer to invoke resend
data that may have been 
cached in the session.

New Text:

InvalidSession: Used only when a Producer
session has expired and the 
Producer needs the Consumer to reinvoke
the operation resending user 
profile and URL templates that may have
been stored in the Producer 
session. If both userContextStoredInSession
and templatesStoredInSession 
fields of the PortletDescription type
are false, Producers are 
encouraged to reinitialize the session
in stead of returning the 
InvalidSession fault.

Compatibility Issues: None

Reasoning: The original statement is not
clear. The new text clarifies 
the issue, and includes guidance.