Re: [whatwg/fetch] Editorial: Reword how-to section to explain how to use callbacks & controller (PR #1614)

@noamr commented on this pull request.



>  </dl>
 
-<p>When invoked, the <a for=/>fetch</a> operation returns a <a for=/>fetch controller</a>. The
-controller is used for performing actions on a fetch operation that has already started, such as
-<a for="fetch controller" lt=abort>aborting</a> the operation by the user or page logic, or
-<a for="fetch controller" lt=terminate>terminating</a> it due to a browser-internal circumstance.
-
-
+<p>Apart from the callbacks to handle responses, <a for=/>fetch</a> accepts additional callbacks
+for advanced cases.<a for=fetch><i>processEarlyHintsResponse</i></a> is intended specifically for
+<a for=/>responses</a> whose <a for=response>status</a> is 103, and is currently handled only by
+navigations. <a for=fetch><i>processRequestBodyChunkLength</i></a> and
+<a for=fetch><i>processRequestEndOfBody</i></a> notify the client of request body uploading
+progress.
+
+<p>Note that the <a for=/>fetch</a> operation runs <a>in parallel</a>, and it usually posts

Thanks, reworded this a bit.

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