K 10
svn:author
V 3
0mp
K 8
svn:date
V 27
2020-03-18T15:02:09.323774Z
K 7
svn:log
V 274
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)
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D24112

END