   - `callback` is a callback function
   - `options` is an option list
 
+  """ <> @options_doc <> ~S"""
+
   ## Examples
 
       iex> callback = fn (result) -> {:ok, result} end

  - `callback` is a callback function
  - `options` is an option list

  ## Examples

      iex> callback = fn (result) -> {:ok, result} end

  - `callback` is a callback function
  - `options` is an option list

  """ <> @options_doc <> ~S"""

  ## Examples

      iex> callback = fn (result) -> "CommonMark is #{result |> String.strip}" end
