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sleep(9): recover comment with the right reference

--- a/sys/man/9/sleep

+++ b/sys/man/9/sleep

@@ -91,6 +91,14 @@

 .IP

 .B tsleep(&up->sleep, return0, nil, 10);

 .PP

+Both

+.I sleep

+and

+.I tsleep

+can be interrupted by

+.IR postnote

+(see

+.IR kproc (9)).

 .SH SOURCE

 .B /sys/src/9/port/proc.c

 .br