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nested replacement fields may omit arg_id (#1681)

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syntax.html already has examples like `fmt::format("{:.{}f}", 3.14, 1)` using this, 
and https://en.cppreference.com/w/cpp/utility/format/formatter#width_and_precision shows that this is the case for the C++20 std::format

The Format Specification Mini-Language grammar seems to be the only one not showing this; update it to match.
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Kevin Puetz 2020-05-13 19:20:05 -05:00 committed by GitHub
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@ -79,8 +79,8 @@ The general form of a *standard format specifier* is:
fill: <a character other than '{' or '}'> fill: <a character other than '{' or '}'>
align: "<" | ">" | "^" align: "<" | ">" | "^"
sign: "+" | "-" | " " sign: "+" | "-" | " "
width: `integer` | "{" `arg_id` "}" width: `integer` | "{" [`arg_id`] "}"
precision: `integer` | "{" `arg_id` "}" precision: `integer` | "{" [`arg_id`] "}"
type: `int_type` | "a" | "A" | "c" | "e" | "E" | "f" | "F" | "g" | "G" | "L" | "p" | "s" type: `int_type` | "a" | "A" | "c" | "e" | "E" | "f" | "F" | "g" | "G" | "L" | "p" | "s"
int_type: "b" | "B" | "d" | "o" | "x" | "X" int_type: "b" | "B" | "d" | "o" | "x" | "X"