MFC r362171: libc manpages: various improvements from NetBSD
- Add STANDARDS and HISTORY sections within the appropriate manpages
- Mention two USENIX papers within kqueue(2) and strlcpy(3)
Reviewed by: bcr (mentor)
Approved by: bcr (mentor)
Obtained from: NetBSD
Differential Revision: https://reviews.freebsd.org/D24650