comcontrol(8): Grammar fix

Event:		Advanced UNIX Programming Course (Fall'23) at NTHU.
Pull Request:	https://github.com/freebsd/freebsd-src/pull/1032
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Yi-Chen Li 2024-01-12 15:10:53 +08:00 committed by Li-Wen Hsu
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@ -35,7 +35,7 @@ to the given number.
The units are seconds.
The default is 5 minutes, 0 means
waiting forever.
This option needed mainly to specify upper limit of minutes
This option is needed mainly to specify an upper limit of minutes
to prevent modem hanging.
.El
.Pp