Konstantin Belousov 3467f88cd6 Add comments explaining unobvious td_critnest adjustments in
critical_exit().

Based on the discussion with:	jhb
Reviewed by:	imp
Sponsored by:	The FreeBSD Foundation
Differential revision:	D9276
MFC after:	1 week
2017-01-22 19:41:42 +00:00
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