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981b517ccf
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.