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0mp
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2020-04-01T07:28:31.055744Z
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MFC 359071:

Document that posixshmcontrol first appeared in 12.1

Also while here, I am addressing some linting issues.

PR:	243132
Submitted by:	Noah Altunian <nbaltunian gmail com>
Approved by:	bcr (mentor)
Differential Revision:	https://reviews.freebsd.org/D24112

END