Add link to toneBuffer

Add link to toneBufer

webrtc.html

@@ -11411,7 +11411,7 @@ <h2>Event summary</h2>
           <td>The <code><a>RTCDTMFSender</a></code> object has either just
           begun playout of a tone (returned as the <code><a data-link-for=
           "RTCDTMFToneChangeEvent">tone</a></code> attribute) or just ended
-          the playout tones in the
+          the playout of tones in the
           <code><a data-for="RTCDTMFSender">toneBuffer</a></code>
           (returned as an empty value in the
           <code><a data-link-for="RTCDTMFToneChangeEvent">tone</a></code>