rustdoc: Minimal fixes to compile with `MacroKinds`

This makes the minimal fixes necessary for rustdoc to compile and pass
existing tests with the switch to `MacroKinds`. It only works for macros
that don't actually have multiple kinds, and will panic (with a `todo!`)
if it encounters a macro with multiple kinds.

rustdoc needs further fixes to handle macros with multiple kinds, and to
handle attributes and derive macros that aren't proc macros.

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