Adapt AudioScheduledSourceNode ended event to new structure

[queengooborg]

This PR updates the ended event of the AudioScheduledSourceNode API to conform to the new structure.

BCD PR: mdn/browser-compat-data#14963

[github-actions]

Preview URLs

• https://pr12972.content.dev.mdn.mozit.cloud/en-US/docs/Web/API/AudioScheduledSourceNode/ended_event

Flaws

URL: /en-US/docs/Web/API/AudioScheduledSourceNode/ended_event
Title: AudioScheduledSourceNode: ended event
on GitHub
Flaw count: 1

• macros:
  • /en-US/docs/Web/API/AudioScheduledSourceNode/onended redirects to /en-US/docs/Web/API/AudioScheduledSourceNode/ended_event

External URLs

URL: /en-US/docs/Web/API/AudioScheduledSourceNode/ended_event
Title: AudioScheduledSourceNode: ended event
on GitHub

No new external URLs

[Elchi3]

There is also this page: https://developer.mozilla.org/en-US/docs/Web/API/AudioScheduledSourceNode/onended which should be redirected to https://pr12972.content.dev.mdn.mozit.cloud/en-US/docs/Web/API/AudioScheduledSourceNode/ended_event

And the template for the ended_event page is https://developer.mozilla.org/en-US/docs/MDN/Structures/Page_types/API_event_subpage_template

[Elchi3]

@sideshowbarker @queengooborg There are probably a few things to look out for when re-doing event pages. Not sure how to best get into a flow here. Do you need a review checklist or something?

Also @teoli2003 and I try to record the move/redirect commands on the PR, see #12982 or #12597. If there is nothing to redirect, a small comment to say there is no on-* event handler page would be helpful, too.

[queengooborg]

The redirect was actually already performed! I forgot to clean up the old references, though -- will get that fixed, along with standardizing the new events page with the missing sections!