Fix algorithm and typos

index.bs

@@ -936,7 +936,7 @@ interface MediaSession {
         associated <code>Document</code> visiblity state is not "visible".</li>
         <li>If the user agent denies permission to change the microphone state
         to <var>active</var>, reject <var>p</var> with a <a
-        exception>NotAllowedError</a>.</li>
+        exception>NotAllowedError</a> and abort these steps.</li>
         <li>If the user agent exposes the microphone state via
         <a>MediaStreamTrack muted state</a>, the user agent MUST <a>queue a
         task</a> to <a>set MediaStreamTrack muted state</a> on any affected
@@ -947,7 +947,7 @@ interface MediaSession {
       </ul>
     </li>
     <li>
-      Return <var>p</var> be a new promise.
+      Return <var>p</var>.
     </li>
   </ul>
 </p>
@@ -967,7 +967,7 @@ interface MediaSession {
         associated <code>Document</code> visiblity state is not "visible".</li>
         <li>If the user agent denies permission to change the camera state to
         <var>active</var>, reject <var>p</var> with a <a
-        exception>NotAllowedError</a>.</li>
+        exception>NotAllowedError</a> and abort these steps.</li>
         <li>If the user agent exposes the camera state via <a>MediaStreamTrack
         muted state</a>, the user agent MUST <a>queue a task</a> to <a>set
         MediaStreamTrack muted state</a> on any affected
@@ -978,7 +978,7 @@ interface MediaSession {
       </ul>
     </li>
     <li>
-      Return <var>p</var> be a new promise.
+      Return <var>p</var>.
     </li>
   </ul>
 </p>