Move pointerlock events to Element

[Elchi3]

The compat tables are broken on
https://developer.mozilla.org/en-US/docs/Web/API/Document/pointerlockchange_event and
https://developer.mozilla.org/en-US/docs/Web/API/Document/pointerlockerror_event

The idea in the BCD PR mdn/browser-compat-data#16674 was to move these events to Element. Unfortunately, it was missed to move them (instead they were removed). I'm fixing this in BCD in mdn/browser-compat-data#17816.

This PR moves the event pages to Element as originally intended.

[github-actions]

Preview URLs

• /en-US/docs/Web/API/Document/exitPointerLock
• /en-US/docs/Web/API/Document
• /en-US/docs/Web/API/Element/pointerlockchange_event
• /en-US/docs/Web/API/Element/pointerlockerror_event
• /en-US/docs/Web/API/Element/requestPointerLock
• /en-US/docs/Web/API/Pointer_Lock_API
• /en-US/docs/Web/Events

Flaws

Note! 3 documents with no flaws that don't need to be listed. 🎉

URL: /en-US/docs/Web/Events
Title: Event reference
Flaw count: 65

• broken_links:
  • Can't resolve /en-US/docs/Web/API/Document/wheel_event
  • Can't resolve /en-US/docs/Web/API/Document/animationcancel_event
  • Can't resolve /en-US/docs/Web/API/Document/animationend_event
  • Can't resolve /en-US/docs/Web/API/Document/animationiteration_event
  • Can't resolve /en-US/docs/Web/API/Document/animationstart_event
  • and 60 more flaws omitted

---

URL: /en-US/docs/Web/API/Document
Title: Document
Flaw count: 55

• macros:
  • /en-US/docs/Web/API/HTMLAllCollection does not exist
  • /en-US/docs/Web/API/Document/height redirects to /en-US/docs/Web/API/Element/clientHeight
  • /en-US/docs/Web/API/Document/width redirects to /en-US/docs/Web/API/Element/clientWidth
  • /en-US/docs/Web/API/Document/xmlStandalone does not exist
  • /en-US/docs/Web/API/Document/captureEvents does not exist
  • and 39 more flaws omitted
• bad_bcd_links:
  • no explanation!
  • no explanation!
  • no explanation!
  • no explanation!
  • no explanation!
  • and 6 more flaws omitted

---

URL: /en-US/docs/Web/API/Element/pointerlockchange_event
Title: Element: pointerlockchange event
Flaw count: 1

• bad_bcd_queries:
  • No BCD data for query: api.Element.pointerlockchange_event

---

URL: /en-US/docs/Web/API/Element/pointerlockerror_event
Title: Element: pointerlockerror event
Flaw count: 1

• bad_bcd_queries:
  • No BCD data for query: api.Element.pointerlockerror_event

[wbamberg]

👍 thanks @Elchi3 !