For `__init__` parameters in NumPyDoc: Look up documentation either on `__init__` or containing class

[lars-reimann]

Is your feature request related to a problem?

Currently, we always jump directly to the class to find the documentation. This is incorrect for matplotlib.

Desired solution

First, check the docstring of the class. If nothing is found there, check the docstring of the __init__ method. This should be decided for each parameter. Example:

class C:
    """
    Parameters
    ----------
    x: str
        Lorem ipsum 1.
    z: str
        Lorem ipsum 3.
    """

    def __init__(self, x, y, z):
        """
        Parameters
        ----------
        y: str
            Lorem ipsum 2.
        z: str
            Lorem ipsum 4.
        """

For x the description should be "Lorem ipsum 1.". For y the description should be "Lorem ipsum 2.". For z the description should be "Lorem ipsum 3."

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