docs: def _add_indent(string, indent):
      """Add indent of ``indent`` spaces to ``string.split("\n")[1:]``
  
      Useful for formatting in strings to already indented blocks
      """
      lines = string.split("\n")
      first, lines = lines[0], lines[1:]
      lines = ["{indent}{s}".format(indent=" " * indent, s=s)
               for s in lines]
      lines = [first] + lines
      return "\n".join(lines)