Differenciate Erlang types from Elixir ones, and include fully qualified name

[eksperimental]

Code:
https://github.com/eksperimental/ex_doc/blob/a5f02c1bb03651f4fa40f9fc56301d71a515e742/lib/ex_doc/formatter/epub.ex#L150-L152

lib/ex_doc/formatter/epub.ex: The function call on line 151 is expected to have type binary() | maybe_improper_list(byte() | binary() | iolist(), [] | binary()) but it has type chars()
149 
150     "~4..0B-~2..0B-~2..0BT~2..0B:~2..0B:~2..0BZ"
151     |> :io_lib.format(list)
152     |> IO.iodata_to_binary()
153   end

chars() refers to :io_lib.chars()