Kevin Puetz 981b517ccf nested replacement fields may omit arg_id (#1681) ...

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.

2020-05-13 17:20:05 -07:00

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