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Mention namespace fmt::literals in the document (#4002)

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@ -533,12 +533,13 @@ feature](https://en.cppreference.com/w/cpp/feature_test).
## Format String Compilation
`fmt/compile.h` provides format string compilation enabled via the
`FMT_COMPILE` macro or the `_cf` user-defined literal. Format strings
marked with `FMT_COMPILE` or `_cf` are parsed, checked and converted
into efficient formatting code at compile-time. This supports arguments
of built-in and string types as well as user-defined types with `format`
functions taking the format context type as a template parameter in
their `formatter` specializations. For example:
`FMT_COMPILE` macro or the `_cf` user-defined literal (defined in
namespace `fmt::literals`). Format strings marked with `FMT_COMPILE`
or `_cf` are parsed, checked and converted into efficient formatting
code at compile-time. This supports arguments of built-in and string
types as well as user-defined types with `format` functions taking
the format context type as a template parameter in their `formatter`
specializations. For example:
template <> struct fmt::formatter<point> {
constexpr auto parse(format_parse_context& ctx);