Editorial: Cut dev-edition event-handler “must”s

This change fixes a few places in the developer edition that had this language:

> The following are the event handlers (and their corresponding event handler
> event types) that must be supported...

The fix ensure that the developer edition has instead this language:

> The following are the event handlers (and their corresponding event handler
> event types) supported...

That is, the “that must be” part gets suppressed in the developer edition.

source

@@ -37245,8 +37245,9 @@ interface <dfn>TextTrackCue</dfn> : <span>EventTarget</span> {
   <h6 id="cue-events">Event handlers for objects of the text track APIs</h6>
 
   <p>The following are the <span>event handlers</span> that (and their corresponding <span
-  data-x="event handler event type">event handler event types</span>) must be supported, as <span>event handler IDL
-  attributes</span>, by all objects implementing the <code>TextTrackList</code> interface:</p>
+  data-x="event handler event type">event handler event types</span>) <span w-nodev>that must
+  be</span> supported, as <span>event handler IDL attributes</span>, by all objects implementing the
+  <code>TextTrackList</code> interface:</p>
 
   <table>
    <thead>
@@ -37258,8 +37259,9 @@ interface <dfn>TextTrackCue</dfn> : <span>EventTarget</span> {
   </table>
 
   <p>The following are the <span>event handlers</span> that (and their corresponding <span
-  data-x="event handler event type">event handler event types</span>) must be supported, as <span>event handler IDL
-  attributes</span>, by all objects implementing the <code>TextTrack</code> interface:</p>
+  data-x="event handler event type">event handler event types</span>) <span w-nodev>that must
+  be</span> supported, as <span>event handler IDL attributes</span>, by all objects implementing the
+  <code>TextTrack</code> interface:</p>
 
   <table>
    <thead>
@@ -37268,9 +37270,10 @@ interface <dfn>TextTrackCue</dfn> : <span>EventTarget</span> {
     <tr><td><dfn><code data-x="handler-TextTrack-oncuechange">oncuechange</code></dfn> <td> <code data-x="event-media-cuechange">cuechange</code>
   </table>
 
-  <p>The following are the <span>event handlers</span> that (and their corresponding <span
-  data-x="event handler event type">event handler event types</span>) must be supported, as <span>event handler IDL
-  attributes</span>, by all objects implementing the <code>TextTrackCue</code> interface:</p>
+  <p>The following are the <span>event handlers</span> (and their corresponding <span
+  data-x="event handler event type">event handler event types</span>) <span w-nodev>that must
+  be</span> supported, as <span>event handler IDL attributes</span>, by all objects implementing the
+  <code>TextTrackCue</code> interface:</p>
 
   <table>
    <thead>
@@ -93619,9 +93622,9 @@ dictionary <dfn>EventSourceInit</dfn> {
   stop firing, even if they were queued before close() was called -->
 
   <p>The following are the <span>event handlers</span> (and their corresponding <span data-x="event
-  handler event type">event handler event types</span>) that must be supported, as <span>event
-  handler IDL attributes</span>, by all objects implementing the <code>EventSource</code>
-  interface:</p>
+  handler event type">event handler event types</span>) <span w-nodev>that must be</span> supported,
+  as <span>event handler IDL attributes</span>, by all objects implementing the
+  <code>EventSource</code> interface:</p>
 
   <table>
    <thead>
@@ -95873,9 +95876,9 @@ interface <dfn>MessagePort</dfn> : <span>EventTarget</span> {
   <hr>
 
   <p>The following are the <span>event handlers</span> (and their corresponding <span data-x="event
-  handler event type">event handler event types</span>) that must be supported, as <span>event
-  handler IDL attributes</span>, by all objects implementing the <code>MessagePort</code>
-  interface:</p>
+  handler event type">event handler event types</span>) <span w-nodev>that must be</span> supported,
+  as <span>event handler IDL attributes</span>, by all objects implementing the
+  <code>MessagePort</code> interface:</p>
 
   <table>
    <thead>
@@ -96145,9 +96148,9 @@ interface <dfn>BroadcastChannel</dfn> : <span>EventTarget</span> {
   <hr>
 
   <p>The following are the <span>event handlers</span> (and their corresponding <span data-x="event
-  handler event type">event handler event types</span>) that must be supported, as <span>event
-  handler IDL attributes</span>, by all objects implementing the <code>BroadcastChannel</code>
-  interface:</p>
+  handler event type">event handler event types</span>) <span w-nodev>that must be</span> supported,
+  as <span>event handler IDL attributes</span>, by all objects implementing the
+  <code>BroadcastChannel</code> interface:</p>
 
   <table>
    <thead>
@@ -96749,8 +96752,9 @@ interface <dfn>WorkerGlobalScope</dfn> : <span>EventTarget</span> {
   </div>
 
   <p>The following are the <span>event handlers</span> (and their corresponding <span data-x="event
-  handler event type">event handler event types</span>) that must be supported, as <span>event handler IDL attributes</span>,
-  by objects implementing the <code>WorkerGlobalScope</code> interface:</p>
+  handler event type">event handler event types</span>) <span w-nodev>that must be</span> supported,
+  as <span>event handler IDL attributes</span>, by objects implementing the
+  <code>WorkerGlobalScope</code> interface:</p>
 
   <table>
    <thead>
@@ -96838,9 +96842,9 @@ interface <dfn>DedicatedWorkerGlobalScope</dfn> : <span>WorkerGlobalScope</span>
   </div>
 
   <p>The following are the <span>event handlers</span> (and their corresponding <span data-x="event
-  handler event type">event handler event types</span>) that must be supported, as <span>event
-  handler IDL attributes</span>, by objects implementing the <code>DedicatedWorkerGlobalScope</code>
-  interface:</p>
+  handler event type">event handler event types</span>) <span w-nodev>that must be</span> supported,
+  as <span>event handler IDL attributes</span>, by objects implementing the
+  <code>DedicatedWorkerGlobalScope</code> interface:</p>
 
   <table>
    <thead>
@@ -96911,9 +96915,9 @@ interface <dfn>SharedWorkerGlobalScope</dfn> : <span>WorkerGlobalScope</span> {
   </div>
 
   <p>The following are the <span>event handlers</span> (and their corresponding <span data-x="event
-  handler event type">event handler event types</span>) that must be supported, as <span>event
-  handler IDL attributes</span>, by objects implementing the <code>SharedWorkerGlobalScope</code>
-  interface:</p>
+  handler event type">event handler event types</span>) <span w-nodev>that must be</span> supported,
+  as <span>event handler IDL attributes</span>, by objects implementing the
+  <code>SharedWorkerGlobalScope</code> interface:</p>
 
   <table>
    <thead>
@@ -97351,11 +97355,11 @@ interface <dfn>AbstractWorker</dfn> {
   attribute <span>EventHandler</span> <span data-x="handler-AbstractWorker-onerror">onerror</span>;
 };</pre>
 
-  <p>The following are the <span>event handlers</span> (and their
-  corresponding <span data-x="event handler event type">event handler
-  event types</span>) that must be supported, as <span>event handler IDL attributes</span>, by
-  <span w-nodev>objects implementing the <code>AbstractWorker</code> interface</span><span
-  w-nohtml><code>Worker</code> and <code>SharedWorker</code> objects</span>:</p>
+  <p>The following are the <span>event handlers</span> (and their corresponding <span data-x="event
+  handler event type">event handler event types</span>) <span w-nodev>that must be</span> supported,
+  as <span>event handler IDL attributes</span>, by <span w-nodev>objects implementing the
+  <code>AbstractWorker</code> interface</span><span w-nohtml><code>Worker</code> and
+  <code>SharedWorker</code> objects</span>:</p>
 
   <table>
    <thead>
@@ -97566,8 +97570,9 @@ enum <dfn>WorkerType</dfn> { "classic", "module" };
   </div>
 
   <p>The following are the <span>event handlers</span> (and their corresponding <span data-x="event
-  handler event type">event handler event types</span>) that must be supported, as <span>event handler IDL attributes</span>,
-  by objects implementing the <code>Worker</code> interface:</p>
+  handler event type">event handler event types</span>) <span w-nodev>that must be</span> supported,
+  as <span>event handler IDL attributes</span>, by objects implementing the <code>Worker</code>
+  interface:</p>
 
   <table>
    <thead>
@@ -113572,8 +113577,9 @@ interface <dfn>HTMLMarqueeElement</dfn> : <span>HTMLElement</span> {
   <hr>
 
   <p>The following are the <span>event handlers</span> (and their corresponding <span data-x="event
-  handler event type">event handler event types</span>) that must be supported, as <span>event handler content attributes</span> and <span>event handler IDL
-  attributes</span>, by <code>marquee</code> elements:</p>
+  handler event type">event handler event types</span>) <span w-nodev>that must be</span> supported,
+  as <span>event handler content attributes</span> and <span>event handler IDL attributes</span>, by
+  <code>marquee</code> elements:</p>
 
   <table>
    <thead>