Potential mistake in docstring of padded_key in crypto module

[Rishabh Goel]

The docstring of padded_key() is as follows:

"""Return a string of the distinct characters of ``symbols`` with
    those of ``key`` appearing first, omitting characters in ``key``
    that are not in ``symbols``. A ValueError is raised if a) there are
    duplicate characters in ``symbols`` or b) there are characters
    in ``key`` that are  not in ``symbols``.

A ValueError is raised if there are characters in ``key`` which are not in ``symbols``. However, The docstring initially mentions that the characters in ``key`` will be omitted if not present in ``symbols`` and then a complete opposite follows. May  I fix this?

[Aaron Meurer]

Yes, this looks like it is contradictory. Please feel free to submit a pull request fixing it to match the actual behavior.

Aaron Meurer

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