[Editorial] Typo occurance -> occurrence in section's id

[Kaiido]

This commit fixes a small typo in the id of the section https://dom.spec.whatwg.org/#action-versus-occurance. Since this id is probably used in many places, we kept a <span> with the previous id to preserve the previous link (Thanks @sideshowbarker for the suggestion).

Ps: I'm not too used to bikeshed, but for whatever reasons it was requesting the id to be hardcoded, instead of deriving it from the title's content.

• [ ] At least two implementers are interested (and none opposed):
  • N/A this is editorial only
• [ ] Tests are written and can be reviewed and commented upon at:
  • N/A
• [ ] Implementation bugs are filed:
  • Chrome: …
  • Firefox: …
  • Safari: …
  • Deno (only for aborting and events): …
  • Node.js (only for aborting and events): …

(See WHATWG Working Mode: Changes for more details.)

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[domenic]

You should be able to use oldids="" instead of the manual <span>, for Bikeshed spec. (HTML/Wattsi requires the span trick.)

[Kaiido]

Great that even avoid the ugly line break ;-)

[annevk]

Thanks @Kaiido (and @domenic)!