CPP11 — Misleading text for DSI invoke() and _primary_interface()

Summary: Section 20.38.3 of the CORBA 2.3 draft states:
I believe that the intent of this paragraph is to forbid the user from
calling invoke() and _primary_interface() directly, not to forbid the
POA from calling _primary_interface() in circumstances other than
processing a request.

The paragraph should be reworded to say:

"The invoke() and _primary_interface() methods will be called by the
POA, and should never be explicitly called by the application."

Close no change. This issue is already addressed in the CORBA 2.3 specification.