remove unneeded whtiespace

Co-authored-by: Marcos Cáceres <marcos@marcosc.com>

getusermedia.html

@@ -305,8 +305,8 @@ <h2>{{MediaStream}}</h2>
       <p>A {{MediaStream}} object is said to be <dfn data-dfn-for=stream id=
       "stream-audible" data-dfn-for=stream>audible</dfn> when it has at least one
       {{MediaStreamTrack}} whose {{MediaStreamTrack/[[Kind]]}} is <a>"audio"</a>
-      that has not [= MediaStreamTrack/ended =]. A {{MediaStream}} that does not have any
-      audio tracks or only has audio tracks that are [= MediaStreamTrack/ended =] is
+      that has not [=MediaStreamTrack/ended=]. A {{MediaStream}} that does not have any
+      audio tracks or only has audio tracks that are [=MediaStreamTrack/ended=] is
       <dfn id="stream-inaudible" data-dfn-for=stream>inaudible</dfn>.</p>
       <p>The [=User Agent=] may update a {{MediaStream}}'s [=track set=] in response to, for example, an external
       event. This specification does not specify any such cases, but other