Admin guide updates

More changes to match the Admin Guide with the Icehouse GUI.
Also cleaning up some wording and other editing stuff.
Relatively small changes to smallish files, for the most part.

...and some niceness fixes that I thought I'd gotten earlier.

Added Diane's fixes

Change-Id: I867cb38629803be1993a318e933416e2bca3e87c
Merge "Admin guide updates"