Make sphinx's autodoc show default values in parameters' description

This is not possible and must be done manually.

defaults to is the keyword now. See https://github.com/sglvladi/Sphinx-RTD-Tutorial/blob/a69fd09/docs/source/docstrings.rst#the-sphinx-docstring-format

"""[Summary]

:param [ParamName]: [ParamDescription], defaults to [DefaultParamVal]
:type [ParamName]: [ParamType](, optional)
...
:raises [ErrorType]: [ErrorDescription]
...
:return: [ReturnDescription]
:rtype: [ReturnType]
"""