Editorial: Link fixes/simplifications

[inexorabletash]

• Add link-defaults entry for "event" (use DOM's)
• Add a "for" for the ECMAScript anchors, use it to disambiguate.
• Drop anchor for DOM's Document (no longer needed)
• Drop anchor for ECMAScript's TypeError - use IDL's interface instead
• Turn on "Assume Explicit For" - yay!

No normative changes.

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[inexorabletash]

Hey @marcoscaceres - could you take a quick look?