gre(4): Add a STANDARDS section
Expand the mentioned RFC in the SEE ALSO section
and reference RFC1701 and RFC1702.
PR: 240250
Reviewed by: bcr (mentor)
Approved by: bcr (mentor)
Obtained from: OpenBSD
MFC after: 7 days
Differential Revision: https://reviews.freebsd.org/D25504
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head/share/man/man4/gre.4