Suggest latest version on the home page

Author: eliben

public/index.html

@@ -26,7 +26,9 @@
 
       <p>
         Unless stated otherwise, examples here assume the
-        <a href="https://go.dev/doc/devel/release">latest major release Go</a>.
+        <a href="https://go.dev/doc/devel/release">latest major release Go</a>
+        and may use new language features. Try to upgrade to the latest
+        version if something isn't working.
       </p>
 
       <ul>