[IPP] [PWG5100.1] Issue #87: Section 5.1: uses of "feed-orientation" and "orientation-requested" lack source reference citations

[smith.kennedy at hp.com]

[Issue Unconfirmed]

In Section 5.1, "feed-orientation" and "orientation-requested" are
discussed. But there are no references pointing the reader to where they
are defined (5100.11 and STD 92). Add relevant references.

Link: http://www.pwg.org/issues/87