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bpo-32720: Fixed the replacement field grammar documentation. (GH-5544) (GH-5547)

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`arg_name` and `element_index` are defined as `digit`+ instead of `integer`.
(cherry picked from commit 7a561afd2c)

Co-authored-by: Mariatta <Mariatta@users.noreply.github.com>
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Miss Islington (bot) 2018-02-12 00:07:55 -08:00 • committed by GitHub
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Doc/library/string.rst
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@ -202,9 +202,9 @@ The grammar for a replacement field is as follows:
.. productionlist:: sf
replacement_field: "{" [`field_name`] ["!" `conversion`] [":" `format_spec`] "}"
field_name: arg_name ("." `attribute_name` | "[" `element_index` "]")*
arg_name: [`identifier` | `integer`]
arg_name: [`identifier` | `digit`+]
attribute_name: `identifier`
element_index: `integer` | `index_string`
element_index: `digit`+ | `index_string`
index_string: <any source character except "]"> +
conversion: "r" | "s" | "a"
format_spec: <described in the next section>