[wsrp-wsia] [change request #243] extensions field description

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

Document: Spec
Section: From 5.1.6 onwards:
Requested by: Andre Kramer
Old Text: extensions: The extension field MAY be used to extend this structure
with
elements from namespaces other than WSRP

New Text: extensions: The extension field MAY be used
to extend this structure.
Extension elements MUST be from a namespace other than WSRP.

Reasoning: not clear if MAY flows into the namespace
constraint. One of our reviewers also
suggested this one.