doc: release notes for html/template

Change-Id: Ifdc3c5b840e6833f14c8e52948e45d5faa5a0615
Reviewed-on: https://go-review.googlesource.com/c/go/+/181940Reviewed-by: Ian Lance Taylor <iant@golang.org>

doc/go1.13.html

@@ -182,7 +182,8 @@ TODO
 <dl id="html/template"><dt><a href="/pkg/html/template/">html/template</a></dt>
   <dd>
     <p><!-- CL 175218 -->
-      TODO: <a href="https://golang.org/cl/175218">https://golang.org/cl/175218</a>: add support for JavaScript modules
+      When using a <code>&lt;script&gt;</code> tag with "module" set as the
+      type attribute, code will now be interperted as <a href="https://html.spec.whatwg.org/multipage/scripting.html#the-script-element:module-script-2">JavaScript module script</a>.
     </p>
 
 </dl><!-- html/template -->