CORBA23 — Clarifications needed in section 5.2.2

Summary: In section 5.2.2 it states in the second paragraph that instances of
valuetypes passed into valuetype methods are passed by reference (in a
programming language sense). That"s fine, but:

1. This paragraph should also state that returned results are passed
by reference. This is necessary to ensure consistent IDL
valuetype semantics across different implementation languages.

2. The last sentence of the following paragraph is confusing because
it appears to contradict the statement in the second paragraph
about reference semantics. It says that "normal semantics for the
programming language in question apply". So if I have a language
that only does pass-by-value, pass-by-value semantics would apply
(so this says). This cannot be correct, since it would prevent
valuetypes from having well-defined semantics at the IDL level.

Fix it.