Remove self referencing link

Making this "Remove" a link to the algorithm was making the algorithm loop endlessly. Here we're not calling that algorithm again, we're just using the track set's remove method (from infra: https://infra.spec.whatwg.org/#list-remove).

getusermedia.html

@@ -337,7 +337,7 @@ <h2>{{MediaStream}}</h2>
           <p>If <var>track</var> is not in <var>stream's</var> [=track set=], then abort these steps.</p>
         </li>
         <li>
-          <p>[=MediaStream/Remove a track|Remove=] <var>track</var> from <var>stream</var>'s [=track set=].</p>
+          <p>Remove <var>track</var> from <var>stream</var>'s [=track set=].</p>
         </li>
         <li>
           <p>[= Fire a track event =] named {{removetrack}} with