Add markup to split out the GSS negotiation control flow

Reindent locally but not globally for the added subsections.

Change-Id: Ieefab32a42f81b5b888dcc5c268dca5e8825373a
Make draft-wilkinson-afs3-rxgk-06

Change-Id: Ia4272d2189800553a2502f2c38546a11aaf917d1
Add initials explicitly

Not sure why this worked before and doesn't anymore.

Change-Id: Ic1b01b014ead9d5f884efb49515451071d1b074b