IEx h: sort results by arity

[eksperimental]

The results were not sorted, when calling:
h Module.function_name

Example:

iex)> h :erlang.float_to_binary
                           :erlang.float_to_binary/2

  @spec float_to_binary(float, options) :: binary()
        when float: float(),
             options: [option],
             option:
               {:decimals, decimals :: 0..253}
               | {:scientific, decimals :: 0..249}
               | :compact

Module was compiled without docs. Showing only specs.

                           :erlang.float_to_binary/1

  @spec float_to_binary(float) :: binary() when float: float()

Module was compiled without docs. Showing only specs.

Now the results are sorted by arity.

[josevalim]

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