Update index.html

Co-authored-by: youennf <[email protected]>

Author: handellm

index.html

@@ -1250,7 +1250,7 @@ <h3>Local video capture timestamps</h3>
       <p>
         The user agent MUST set the [=capture timestamp=] of each video frame that is sourced from
         {{MediaDevices/getUserMedia()}} and {{MediaDevices/getDisplayMedia()}} to its best estimate of the time that
-        the frame was captured, which MUST be in the past relative to the time the frame is appearing on the track.
+        the frame was captured.
         This value MUST be monotonically increasing.
       </p>
     </section>