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fork(2): document new error behaviour when out of resources

--- a/sys/man/2/fork

+++ b/sys/man/2/fork

@@ -145,11 +145,11 @@

 Without

 .BR RFPROC ,

 the return value is zero.

-Process ids range from 1 to the maximum integer

+Process ids range from 1 to the maximum positive integer

 .RB ( int )

 value.

 .I Rfork

-will sleep, if necessary, until required process resources are available.

+may also return -1 if process resources are exhausted.

 .PP

 .I Fork

 is just a call of