CPP11 — resolve_initial_references missing from Orb interface

Summary: Are you looking at CORBA 2.2, document orbos/98-02-01?

Section 20.31.4 covers ORB_init and friends. The POA is an ordinary IDL
interface that just follows the ordinary C++ mapping rules, so it needs no
special mention. The C++ server side is explained in 20.33 through 20.38.

You are correct that resolve_initial_references is missing from the ORB
interface. This was because it used to be covered in another section, and
it appears to have been inadvertantly dropped by the editors at the OMG.
Juergen, this should be logged as a cxx_revision issue. However,
resolve_initial_references just follows the regular C++ mapping rules, so
there"s really no harm in it being missing.

Add the missing text.