[release-branch.go1.3] doc: fix happens-before rules for buffered channels
[release-branch.go1.3] doc: fix happens-before rules for buffered channels

««« CL 101980047 / 12c9a9ff50d8
doc: fix happens-before rules for buffered channels
The current wording is reversed in 2 places.
Not sure how it got 4 LGTMs (mine was there as well).
Update #6242.

LGTM=dan.kortschak, r, rsc
R=golang-codereviews, 0xjnml, dan.kortschak, r, rsc
CC=golang-codereviews
https://golang.org/cl/101980047
»»»

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews, r
https://golang.org/cl/106830047

klueska/go-akaros,klueska/go-akaros,klueska/go-akaros,klueska/go-akaros,klueska/go-akaros,klueska/go-akaros,klueska/go-akaros,klueska/go-akaros