fix-typo

getusermedia.html

@@ -1642,7 +1642,7 @@ <h2>Constrainable Properties</h2>
                 "MediaStreamTrack">applyConstraints()</a>, since any attempt to
                 set a different value will result in an unsatisfiable
                 <a>ConstraintSet</a>.
-                If a string of length 0 is used as a deviceID value constraint
+                If a string of length 0 is used as a deviceId value constraint
                 with <a data-link-for="MediaDevices">getUserMedia()</a>, it
                 MAY be interpreted as if the constraint is not specified.
               </td>