Fixes following feedback

dom.bs

@@ -1226,12 +1226,12 @@ property of the event being dispatched.
 <p>Ideally, any new event APIs are defined such that they do not need this property. (Use
 <a href="https://github.com/whatwg/dom/issues">whatwg/dom</a> for discussion.)
 
-<p>To <dfn export>legacy-obtain service worker fetch event listeners</dfn> given a
+<p>To <dfn export>legacy-obtain service worker fetch event listener callbacks</dfn> given a
 {{ServiceWorkerGlobalScope}} <var>global</var>, run these steps. They return a <a for=/>list</a> of
 {{EventListener}} objects.
 
 <ol>
- <li><p>Let <var>eventListeners</var> be a new <a for=/>list</a>.
+ <li><p>Let <var>callbacks</var> be « ».
 
  <li><p><a for=list>For each</a> <var>listener</var> of <var>global</var>'s
  <a>event listener list</a>:
@@ -1240,10 +1240,10 @@ property of the event being dispatched.
   <li><p>If <var>listener</var>'s <a for="event listener">type</a> is "<code>fetch</code>", and
   <var>listener</var>'s <a for="event listener">callback</a> is not null, then
   <a for=list>append</a> <var>listener</var>'s <a for="event listener">callback</a> to
-  <var>eventListeners</var>.
+  <var>callbacks</var>.
  </ol>
 
- <li><p>Return <var>eventListeners</var>.
+ <li><p>Return <var>callbacks</var>.
 </ol>
 
 <h3 id=dispatching-events>Dispatching events</h3>