[docs] [issue28978] a redundant right parentheses in the EBNF rules of parameter_list

[woo yoo]

woo yoo added the comment:

Here is the link https://docs.python.org/3/reference/compound_stmts.html#function-definitions

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28978>
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