[FIX] doc: handle unknown browser globals better

Before this, if a new global was added to JS code (module toplevel,
function bodies are not considered) it would blow up when attempting
to resolve variable refs & uses.

Make the toplevel scope a defaultdict such that if e.g. a "foo" is
looked up in a module but not a local variable of that module it's
assumed to be an UnknownNS object (from which further UnknownNS can be
deref'd).

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