Enji Cooper 2c96ea9ca0 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
2020-12-11 00:20:04 +00:00
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