doc: allow buffered channel as semaphore without initialization
This rule not existing has been the source of many discussions on golang-dev and on issues. We have stated publicly that it is true, but we have never written it down. Write it down. Fixes #6242. LGTM=r, dan.kortschak, iant, dvyukov R=golang-codereviews, r, dominik.honnef, dvyukov, dan.kortschak, iant, 0xjnml CC=golang-codereviews https://golang.org/cl/75130045
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