Editorial: update some links

Closes whatwg#1036.

dom.bs

@@ -27,7 +27,7 @@ type: interface
  url: https://w3c.github.io/deviceorientation/spec-source-orientation.html#devicemotion
   text: DeviceMotionEvent
   text: DeviceOrientationEvent
-urlPrefix: https://tc39.github.io/ecma262/#; spec: ECMASCRIPT
+urlPrefix: https://tc39.es/ecma262/#; spec: ECMASCRIPT
  text: Construct; url: sec-construct; type: abstract-op
  type: dfn
   text: Realm; url: realm
@@ -899,7 +899,7 @@ correct defaults.</p>
   Web IDL.
 
   <p class=XXX>As of the time of this writing Web IDL does not yet define any default behavior;
-  see <a href="https://github.com/heycam/webidl/issues/135">heycam/webidl#135</a>.
+  see <a href="https://github.com/whatwg/webidl/issues/135">whatwg/webidl#135</a>.
 
  <li><p>Set <var>event</var>'s <a>initialized flag</a>.
 
@@ -1223,9 +1223,8 @@ listeners are {{AddEventListenerOptions/passive}} then scrolling can be allowed
 of non-{{AddEventListenerOptions/passive}} listeners, and use that to clear the {{Event/cancelable}}
 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://lists.w3.org/Archives/Public/public-script-coord/">[email protected]</a>
-for discussion).
+<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.)
 
 
 <h3 id=dispatching-events>Dispatching events</h3>