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
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head/usr.bin/posixshmcontrol/posixshmcontrol.1