time: stop referring to timerproc in comment
time: stop referring to timerproc in comment

The timerproc function has been removed.

Fixes #37774

Change-Id: Ice5e1d8fec91cd6ee7f032e0d21e8315a26bc6a3
Reviewed-on: https://go-review.googlesource.com/c/go/+/222783
Reviewed-by: Alberto Donizetti <90b16103a35511ced020676f3544f17117fb4c92@gmail.com>

cloudflare/go,cloudflare/go,nawawi/go,akutz/go,cloudflare/go,CAFxX/go,CAFxX/go,akutz/go,akutz/go,golang/go,CAFxX/go,akutz/go,cloudflare/go,golang/go,nawawi/go,cloudflare/go,nawawi/go,nawawi/go,cloudflare/go,golang/go,CAFxX/go,cloudflare/go,nawawi/go,CAFxX/go,akutz/go,nawawi/go,akutz/go,CAFxX/go,golang/go,CAFxX/go,golang/go,akutz/go,cloudflare/go,CAFxX/go,golang/go,golang/go,nawawi/go,akutz/go,nawawi/go,golang/go