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imp
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2021-07-31T05:07:41.620971Z
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V 421
nvmecontrol: document power command

The description of the power command is missing. While the synopsis is
present, there's no explanation. Add one.

Reviewed by:		mav, chuck
PR:			237866
Sponsored by:		Netflix
Differential Revision:	https://reviews.freebsd.org/D31122

(cherry picked from commit 445b5554bf97254a0ead3d70f801871d62dcfb62)

Git Hash:   4905e7273229106f7fc62d2801f5295d50d718d0
Git Author: imp@FreeBSD.org
END