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 <cherryyz@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/doc/articles/race_detector.html b/doc/articles/race_detector.html
index 63a658f..09188c1 100644
--- a/doc/articles/race_detector.html
+++ b/doc/articles/race_detector.html
@@ -418,7 +418,7 @@
   <code>linux/amd64</code>, <code>linux/ppc64le</code>,
   <code>linux/arm64</code>, <code>freebsd/amd64</code>,
   <code>netbsd/amd64</code>, <code>darwin/amd64</code>,
-  and <code>windows/amd64</code>.
+  <code>darwin/arm64</code>, and <code>windows/amd64</code>.
 </p>
 
 <h2 id="Runtime_Overheads">Runtime Overhead</h2>