   @doc ~S"""
   Compiles a list of Markdown documents to CommonMark and calls function for each item.
 
+  - `data` is either a string or a list
+  - `callback` is a callback function
+
   ## Examples
 
       iex> callback = fn (result) -> "CommonMark is #{result |> String.strip}" end

  @doc ~S"""
  Compiles one or more (list) Markdown documents to LaTeX and returns result.

  ## Examples

      iex> "test" |> Cmark.to_latex

  @doc ~S"""
  Compiles one or more (list) Markdown documents to HTML and returns result.

  - `data` is either a string or a list

  ## Examples

      iex> "test" |> Cmark.to_html
