[docs] [issue24323] Typo in Mutable Sequence Types documentation.

[Eric V. Smith]

Eric V. Smith added the comment:

It's trying to say that "i" is optional, as stated in the footnote. I agree it would be better written as "s.pop(i)", since square brackets are otherwise used in that section as indexing operators. But the footnote should stay, explaining what happens if you omit the parameter.

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nosy: +eric.smith

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<http://bugs.python.org/issue24323>
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