Drop extra bytesLength reference

Author: lukewarlow

fetch.bs

@@ -8646,8 +8646,6 @@ method steps are:
   <ol>
    <li><p>If <var>hasUploadListeners</var> is false, then return.
 
-   <li><p>Increase <var>requestBodyTransmitted</var> by <var>bytesLength</var>.
-
    <li><p><a>Fire a progress event</a> named <a event><code>progress</code></a> at <var>requestObserver</var>
    with <var>requestBodyTransmitted</var> and <var>requestBodyLength</var>.
   </ol>