📝 update documentation

doc/mkdocs/docs/features/binary_formats/ubjson.md

@@ -28,6 +28,7 @@ number_unsigned | 128..255                          | uint8       | `U`
 number_unsigned | 256..32767                        | int16       | `I`
 number_unsigned | 32768..2147483647                 | int32       | `l`
 number_unsigned | 2147483648..9223372036854775807   | int64       | `L`
+number_unsigned | 2147483649..18446744073709551615  | high-precision | `H`
 number_float    | *any value*                       | float64     | `D`
 string          | *with shortest length indicator*  | string      | `S`
 array           | *see notes on optimized format*   | array       | `[`
@@ -44,7 +45,6 @@ object          | *see notes on optimized format*   | map         | `{`
 	The following values can **not** be converted to a UBJSON value:
 
       - strings with more than 9223372036854775807 bytes (theoretical)
-      - unsigned integer numbers above 9223372036854775807
 
 !!! info "Unused UBJSON markers"