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stream(3): fix reference

--- a/sys/man/3/stream

+++ b/sys/man/3/stream

@@ -34,7 +34,7 @@

 to the file. A zero-length write can be used to wait for the

 buffered data to drain and return any previous write errors.

 .SH SEE ALSO

-.IR dup (2),

+.IR dup (3),

 .IR pipe (3)

 .SH SOURCE

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