There are currently two docs describing flavors in 'admin', which
contain a lot of overlapping information. Fix this by keeping the
configuration guide (how to create, delete, modify flavors) in
'admin', while moving the reference-style parts into 'user'. We
cross-reference the two internally.
Given that large chunks of this needed to be rewritten, we've taken the
opportunity to fix a poor description for the RXTX factor, closing a
longstanding bug in the process.
Change-Id: Ia57c93ef1e72ccf134ba6fc7fcb85ab228d68a47
Closes-Bug: #1688054
a76277f81a