[release-branch.go1.7] doc: remove Reddit as an official space where Code of Conduct applies

Fixes #18289

Change-Id: I047e98cc36b861ef15292170aeaff8bc29243cab
Reviewed-on: https://go-review.googlesource.com/34281
Reviewed-by: Russ Cox <[email protected]>
(cherry picked from commit 265e547)
Reviewed-on: https://go-review.googlesource.com/34282

Author: bradfitz

doc/conduct.html

@@ -67,7 +67,6 @@ <h3 id="spaces">Where does the Code of Conduct apply?</h3>
     <li>The <a href="https://groups.google.com/group/golang-nuts">golang-nuts</a> and
         <a href="https://groups.google.com/group/golang-dev">golang-dev</a> mailing lists.
 <li>The #go-nuts IRC channel on Freenode.
-<li>The <a href="https://reddit.com/r/golang">/r/golang subreddit</a>.
 </ul>
 
 <p>