NOT12 — The term name-value pair is not well defined

Summary: 1) The term name-value pair is not well defined in the Notification
document.

Suggested resolution:

We need to decide as a group to explicitly state that either only
CosNotification::PropertySeq is supported (as well as structutally
equivalent types only when IIOP messages elide member naming or IR
info), OR that any structurally equivalent type is supported.
I would favour the former - as it allows implementers to rely on the
TypeCode::equal() operation to do comparisons portably rather
than doing explicit traversals of the typecode.

Added text to 2nd paragraph of section 2.5.2