sequence.right_join doc example code

[BebeSparkelSparkel]

Right and left join have the same example code in their docs.

>>> seq([('a', 1), ('b', 2)]).join([('a', 3), ('c', 4)])
        [('a', (1, 3)), ('b', (2, None)]

I think it should be

>>> seq([('a', 1), ('b', 2)]).join([('a', 3), ('c', 4)])
        [('a', (1, 3)), ('c', (None, 4)]

[BebeSparkelSparkel]

Changed this in PR: Cleanup #107

[EntilZha]

Nice catch, if you separate this out into its own little change I can merge independently of the rest of the stuff

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