[whatwg/dom] Updates to element creation and cross-references (#231)

See individual commits for details.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/231

-- Commit Summary --

  * Update custom element cross-spec references
  * Fix a few cross-linking missteps
  * Make "is" and "prefix" optional in "create an element"
  * Use "create an element" in createHTMLDocument

-- File Changes --

    M dom.bs (69)
    M dom.html (105)

-- Patch Links --

https://github.com/whatwg/dom/pull/231.patch
https://github.com/whatwg/dom/pull/231.diff

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