doc/articles/race_detector.html: add darwin/arm64
doc/articles/race_detector.html: add darwin/arm64

Updates #38485.

Change-Id: I46f515973c0a31d7c3e0e05ce006121c60c4041e
Reviewed-on: https://go-review.googlesource.com/c/go/+/268497
Trust: Cherry Zhang <d62e63aa42ce272d7b6a5055d97e942b33a34679@google.com>
Reviewed-by: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@golang.org>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

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