doc: Describe Packet Link mode in the initial usage section
authorKeith Packard <keithp@keithp.com>
Fri, 5 Oct 2018 06:03:12 +0000 (23:03 -0700)
committerKeith Packard <keithp@keithp.com>
Fri, 5 Oct 2018 06:03:12 +0000 (23:03 -0700)
It's not described in any detail elsewhere...

Signed-off-by: Keith Packard <keithp@keithp.com>

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