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Document that hexfloat 'a'/'A' always emits the 0x prefix (#4862)

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@ -251,7 +251,7 @@ fmt::format("{:#06x}", 0xfe); // # adds the prefix, 06 zero-pads to width 6
| Type | Effect |
|------|---------------------------------------------------------------------|
| `a` | Hexadecimal-significand form (e.g. `1.8p+1`). Lower-case digits and a lower-case `p` for the binary exponent. The `#` flag adds a `0x` prefix. |
| `a` | Hexadecimal-significand form (e.g. `0x1.8p+1`). Lower-case digits and a lower-case `p` for the binary exponent. The `0x` prefix is always emitted, matching printf's `%a`. The `#` flag forces a decimal point (e.g. `0x1.p+1`).
| `A` | Same as `a`, but upper-case throughout. |
| `e` | Scientific notation with a lower-case `e` for the decimal exponent. |
| `E` | Scientific notation with an upper-case `E`. |