Fix method commenting

[ksss]

The result of the comment is broken because there is no distinction between a code ending comment and a comment without a code.

---

t.rb

# Foo doc
module Foo # :nodoc:
  # foo doc
  def foo
  end
end

Before

module Foo
  # Foo doc
  # :nodoc:
  # foo doc
  def foo: () -> nil
end

After

# Foo doc
module Foo
  # foo doc
  def foo: () -> nil
end

[soutaro]

🙇‍♂️

[soutaro]

🙏