doc: update signal.Notify example to use buffered channel
This if follow up of CL 274332. Updates #9399. Change-Id: Ic6dd534dc18227a799cbb9577979f2285596b825 Reviewed-on: https://go-review.googlesource.com/c/go/+/274393 Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com> Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by:Ian Lance Taylor <iant@golang.org>
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