def get_callable_documentation(the_callable):
return wrap_text_in_a_box(<EOL>title=get_callable_signature_as_string(the_callable),<EOL>body=(getattr(the_callable, '<STR_LIT>') or '<STR_LIT>').replace(<EOL>'<STR_LIT:\n>', '<STR_LIT>'),<EOL>style='<STR_LIT>')<EOL>
Return a string with the callable signature and its docstring.

    :param the_callable: the callable to be analyzed.
    :type the_callable: function/callable.
    :return: the signature.