[docs] [issue28944] A lack of comma within EBNF rule of keywords_arguments

[woo yoo]

New submission from woo yoo:

This is the documented rule, which lacks a comma within the last line.
keywords_arguments   ::=  (keyword_item | "**" expression)
                          ("," keyword_item | "**" expression)*
The correct form should be:
keywords_arguments   ::=  (keyword_item | "**" expression)
                          ("," keyword_item |",""**" expression)*

The original documentation is https://docs.python.org/3/reference/expressions.html#calls

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assignee: docs at python
components: Documentation
messages: 282987
nosy: docs at python, woo yoo
priority: normal
severity: normal
status: open
title: A lack of comma within EBNF rule of keywords_arguments
versions: Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28944>
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