Fix bare module_function handling

[skatkov]

module Bare
  module_function

  # Parses a source.
  def parse(source); end
end

RDoc 8.1.0 still reports .parse as a public instance method

Form	RDoc 8.1.0
Bare module_function, then method definitions	Incorrect: public instance method
module_function :parse	Correct: public singleton method
module_function def parse(...)	Correct: public singleton method

It should be a public singleton method.

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