Fixes golang/go#60627.

Author: leimao

_content/doc/tutorial/create-module.html

@@ -67,6 +67,9 @@ <h2 id="prerequisites">Prerequisites</h2>
     <strong>Some programming experience.</strong> The code here is pretty
     simple, but it helps to know something about functions, loops, and arrays.
   </li>
+  <li>
+    <strong>An installation of Go 1.20 or later.</strong>
+  </li>
   <li>
     <strong>A tool to edit your code.</strong> Any text editor you have will
     work fine. Most text editors have good support for Go. The most popular are