go.dev/_content/about.md: mention blog post on retractions

Change-Id: I6ddea1c76244806439da9990758f15db466a01d4
Reviewed-on: https://go-review.googlesource.com/c/website/+/327750
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
diff --git a/go.dev/_content/about.md b/go.dev/_content/about.md
index 2272ebd..09ba209 100644
--- a/go.dev/_content/about.md
+++ b/go.dev/_content/about.md
@@ -31,8 +31,9 @@
 If you would like to hide versions of a module on pkg.go.dev, as well as from
 the `go` command, you should retract them. Retracting a module version involves
 adding a `retract` directive to your `go.mod` file and publishing a new version.
-See the [modules reference](https://golang.org/ref/mod#go-mod-file-retract) for
-details.
+See the Go blog post [New module changes in Go
+1.16](https://blog.golang.org/go116-module-changes#TOC_5.) and the [modules
+reference](https://golang.org/ref/mod#go-mod-file-retract) for details.
 
 ## Documentation
 
diff --git a/go.dev/testdata/golden/about/index.html b/go.dev/testdata/golden/about/index.html
index 7c0f18b..8ad2015 100644
--- a/go.dev/testdata/golden/about/index.html
+++ b/go.dev/testdata/golden/about/index.html
@@ -151,8 +151,9 @@
 <p>If you would like to hide versions of a module on pkg.go.dev, as well as from
 the <code>go</code> command, you should retract them. Retracting a module version involves
 adding a <code>retract</code> directive to your <code>go.mod</code> file and publishing a new version.
-See the <a href="https://golang.org/ref/mod#go-mod-file-retract" rel="noreferrer" target="_blank">modules reference</a> for
-details.</p>
+See the Go blog post <a href="https://blog.golang.org/go116-module-changes#TOC_5." rel="noreferrer" target="_blank">New module changes in Go
+1.16</a> and the <a href="https://golang.org/ref/mod#go-mod-file-retract" rel="noreferrer" target="_blank">modules
+reference</a> for details.</p>
 
 <h2 id="documentation">Documentation</h2>