Fix an issue with multiline param tags

[connorshea]

If you had multi-line param tags, that broke the output RBI.

e.g. given this input:

module A
  # Lorem ipsum dolor.
  #
  # @param a [String] Lorem ipsum dolor
  #   sit amet.
  #
  # @return [String]
  def x(a); end
end

Sord would provide this output:

# typed: strong
module A
  # Lorem ipsum dolor.
  # 
  # _@param_ `a` — Lorem ipsum dolor
sit amet.
  sig { params(a: String).returns(String) }
  def x(a); end
end