MFC r358099:
Add some HISTORY sections to manpages
environ(7) was in AT&T Version 7 ac(8): Add a HISTORY section sa(8): Add a HISTORY section sqrt(3): Add the actual sqrt function to the HISTORY section Obtained from: OpenBSD
Submitted by: gbergling@gmail.com
Approved by: bcr@(mentor)
Differential Revision: https://reviews.freebsd.org/D23693