Mark Johnston b8e4cdda35 Clarify slightly the interaction between wait*() and pdfork().
There are multiple ways to wait for any child process to return a
status (e.g., waitpid(-1, ...), waitid(P_ALL, ...)), so don't be so
specific.

MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
2018-10-24 18:42:13 +00:00
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