Add the ex(4) driver to hardware.hlp.

Wipe out most of the obsoleted (2.2-related) changelist from the
relnotes, and add those stuff that came to mind being really new
in 3.0.

Folks, if you add some major feature in -current, please consider
recording it here.  Our users love to know what they're getting by
reading it in a single file.  In particular, the Lite2 mergers might
consider adding information here.

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