Wrong return type in doc creation docstrings, provides incorrect guidance to type checkers

[bennylope]

The DocApi.create_doc() method's docstring includes the wrong return type:

docraptor-python/docraptor/api/doc_api.py

Lines 203 to 206 in 92acc8d

	:return: Returns the result object.
	If the method is called asynchronously,
	returns the request thread.
	:rtype: str

Similarly for DocApi.create_doc_with_http_info:

docraptor-python/docraptor/api/doc_api.py

Lines 241 to 244 in 92acc8d

	:return: Returns the result object.
	If the method is called asynchronously,
	returns the request thread.
	:rtype: tuple(str, status_code(int), headers(HTTPHeaderDict))

The correct return type here are bytes and tuple(bytes, status_code(int), headers(HTTPHeaderDict)), respectively.

Since Python 3, str is reserved for unicode strings, not the byte strings return by HTTP calls.

I know a picture isn't proof but absent a share environment, here's the best I can do.

Why does this matter?

It doesn't affect the working of the library, but it does anyone using any type checking or type hints, e.g. PyCharm below: