XRLightProbe: Use a single event page

[Elchi3]

Summary

The PR is a proposal to only use one event page for the reflectionchange event. It redirects Web/API/XRLightProbe/onreflectionchange to Web/API/XRLightProbe/reflectionchange_event and makes the reflectionchange_event page contain all the event related information.

BCD PR follows.

Motivation

See the discussion at https://github.com/mdn/content/discussions/9098

Metadata

• Adds a new document
• Rewrites (or significantly expands) a document
• Fixes a typo, bug, or other error

[github-actions]

Preview URLs

• https://pr10373.content.dev.mdn.mozit.cloud/en-US/docs/Web/API/XRLightProbe/reflectionchange_event
• https://pr10373.content.dev.mdn.mozit.cloud/en-US/docs/Web/API/XRLightProbe

Flaws

Note! 1 document with no flaws that don't need to be listed. 🎉

URL: /en-US/docs/Web/API/XRLightProbe
Title: XRLightProbe
on GitHub
Flaw count: 1

• bad_bcd_links:
  • no explanation!

External URLs

URL: /en-US/docs/Web/API/XRLightProbe
Title: XRLightProbe
on GitHub

No new external URLs

---

URL: /en-US/docs/Web/API/XRLightProbe/reflectionchange_event
Title: XRLightProbe: reflectionchange event
on GitHub

No new external URLs

[Elchi3]

Thanks for the merge, @sideshowbarker 👍

@ddbeck and I talked a bit about this PR and I opened #10431 to continue that conversation.