Napoleon: Support NumpyDoc "Receives" docstring section

[tcjennings]

Support the "Receives" section of NumpyDoc guidelines; it is related to Yields, which is already supported.

https://numpydoc.readthedocs.io/en/latest/format.html#sections

Receives

Explanation of parameters passed to a generator’s .send() method, formatted as for Parameters, above. Since, like for Yields and Returns, a single object is always passed to the method, this may describe either the single parameter, or positional arguments passed as a tuple. If a docstring includes Receives it must also include Yields.

[tk0miya]

Reasonable. It should be supported.