Adapt CookieStore change event to new structure

[queengooborg]

This PR updates the change event of the CookieStore API to the new format, loosely based on the events template.

BCD PR: mdn/browser-compat-data#14934

[github-actions]

Preview URLs

• https://pr12913.content.dev.mdn.mozit.cloud/en-US/docs/Web/API/CookieStore/change_event
• https://pr12913.content.dev.mdn.mozit.cloud/en-US/docs/Web/API/CookieStore

Flaws

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

• bad_bcd_links:
  • no explanation!

---

URL: /en-US/docs/Web/API/CookieStore/change_event
Title: CookieStore: change event
on GitHub
Flaw count: 1

• bad_bcd_queries:
  • No BCD data for query: api.CookieStore.change_event

External URLs

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

No new external URLs

---

URL: /en-US/docs/Web/API/CookieStore/change_event
Title: CookieStore: change event
on GitHub

No new external URLs

[jpmedley]

@ddbeck I have misplaced the instructions for how we do events now. Can you please send them to me again so that I can review this?

[queengooborg]

@jpmedley The following discussion contains the information I believe you're looking for: https://github.com/mdn/content/discussions/9098#discussioncomment-2140424

[jpmedley]

Thanks!

[queengooborg]

Thanks for reviewing and merging, @jpmedley! Can you also review the corresponding BCD PR?