Fix "An candidate" and mention the "icegatheringstatechange" event.

webrtc.html

@@ -3936,7 +3936,7 @@ <h4><dfn>RTCPeerConnectionIceEvent</dfn></h4>
           different types of indications:
           <ul>
             <li>
-              <p>An candidate has been gathered. The <code><a
+              <p>A candidate has been gathered. The <code><a
               data-link-for="RTCPeerConnectionIceEvent">candidate</a></code>
               member of the event will be populated normally. It should be
               signaled to the remote peer and passed into
@@ -3958,13 +3958,16 @@ <h4><dfn>RTCPeerConnectionIceEvent</dfn></h4>
             <li>
               <p>All <code><a>RTCIceTransport</a></code>s have finished
               gathering candidates, and the <code><a>RTCPeerConnection</a></code>'s
-              <code><a>RTCIceConnectionState</a></code> has transitioned to
-              <code>"<a data-link-for="RTCIceConnectionState">completed</a>"</code>.
+              <code><a>RTCIceGatheringState</a></code> has transitioned to
+              <code>"<a data-link-for="RTCIceGatheringState">complete</a>"</code>.
               This is indicated by the
               <code><a data-link-for="RTCPeerConnectionIceEvent">candidate</a></code>
-              member of the event being set to <code>null</code>. This only exists
-              for backwards compatibility, and this event does not need to be
-              signaled to the remote peer.</p>
+              member of the event being set to <code>null</code>. This only
+              exists for backwards compatibility, and this event does not need
+              to be signaled to the remote peer. It's equivalent to an
+              <code>"<a>icegatheringstatechange</a>"</code> event with the
+              <code>"<a data-link-for="RTCIceGatheringState">complete</a>"</code>
+              state.</p>
             </li>
           </ul>
         </div>