[sympy] 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?

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[sympy] Introduction

[Rishabh Goel]

Hello everyone!
My name is Rishabh Goel and I am a 4th-year Undergrad student. I came 
across this library last year and am trying to understand the library ever 
since. I have a minor project in my 7th semester and thought why not learn 
by working with this library on a real project. I have been using Python 
for over a year now and have developed some projects alongside. I am 
interested in cryptography and will try to contribute to this module. 

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