Editorial: Align with Web IDL specification

[autokagami]

🤖 This is an automated pull request to align the spec with the latest Web IDL specification. 🤖

The followings are the Web IDL validation messages, which may help understanding this PR:

• Validation error at line 4 in periodic-background-sync,2, inside `interface PeriodicSyncManager -> operation register -> argument options`:
  DOMString tag, optional BackgroundSyncOptions options);
                                              ^

  Error: Optional dictionary arguments must have a default value of {}.

Currently this autofix might introduce awkward code formatting, and feel free to manually fix it whenever it happens.

Please file an issue at https://github.com/saschanaz/webidl-updater/issues/new if you think this is invalid or should be enhanced.

[foolip]

@sideshowbarker one change remains here. For some reason I seem to have write access to this repo, but I don't know why, so I'd like to not merge anything myself :)

[sideshowbarker]

@sideshowbarker one change remains here. For some reason I seem to have write access to this repo, but I don't know why,

It’s because I gave you write access. If you don’t want write access, lemme know, and I’ll revert it

so I'd like to not merge anything myself :)

OK, merging it now

[foolip]

@sideshowbarker Ah, I see, I thought I might accidentally have write access via some group membership. I'm OK to have it for future trivial IDL fixes like this, thanks!