runtime/race: fix comment in select_test.TestNoRaceSelect1
runtime/race: fix comment in select_test.TestNoRaceSelect1

selectGoImpl was merged into selectGo in https://golang.org/cl/37860.

Change-Id: I39985f37223743f1ea0aba9bee0e2708398a925c
GitHub-Last-Rev: ec97b4be3298f5595a5cd6109c311dcb35e06663
GitHub-Pull-Request: golang/go#38716
Reviewed-on: https://go-review.googlesource.com/c/go/+/230340
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

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