K 10
svn:author
V 4
ngie
K 8
svn:date
V 27
2022-04-11T01:22:10.080762Z
K 7
svn:log
V 459
posix_spawn(3): fix section that references `vfork`

`vfork(2)` should be referenced in paragraphs as `.Fn vfork`, not `vfork()`.
This change switches the reference to use `.Fn`, which in turn makes the
manpage `make manlint` clean.

MFC after:	1 week
Reported by:	make manlint
Sponsored by:	DellEMC Isilon

(cherry picked from commit 2c96ea9ca0aa37db109700be5ed33afc30133ec1)

Git Hash:   beb0de9a845e941774fc5d6dbd621ba445d8ace9
Git Author: ngie@FreeBSD.org
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