doc/go_faq.html: reference the new wiki page titled Go Code Review Comments

Fixes #7449.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/71610044

doc/go_faq.html

@@ -957,6 +957,14 @@ compendium of do's and don'ts that allows interpretation.
 All the Go code in the repository has been run through <code>gofmt</code>.
 </p>
 
+<p>
+The document titled
+<a href="http://golang.org/s/comments">Go Code Review Comments</a>
+is a collection of very short essays about details of Go idiom that are often
+missed by programmers.
+It is a handy reference for people doing code reviews for Go projects.
+</p>
+
 <h3 id="How_do_I_submit_patches_to_the_Go_libraries">
 How do I submit patches to the Go libraries?</h3>