[whatwg/dom] Editorial: mark initCustomEvent and createEvent as // historical (#821)

Fixes #811.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/821

-- Commit Summary --

  * Mark initCustomEvent as historical
  * Mark createEvent as historical

-- File Changes --

    M dom.bs (6)

-- Patch Links --

https://github.com/whatwg/dom/pull/821.patch
https://github.com/whatwg/dom/pull/821.diff

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