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Update docs/en/sql-reference/functions/bit-functions.md

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Co-authored-by: gyuton <40863448+gyuton@users.noreply.github.com>
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@ -19,7 +19,8 @@ The result type is an integer with bits equal to the maximum bits of its argumen
## bitShiftLeft(a, b) {#bitshiftlefta-b} ## bitShiftLeft(a, b) {#bitshiftlefta-b}
Shifts a value left by specified number of bit positions. Shifts the bit representation of a value to the left by a specified number of bit positions.
A `FixedString` or a `String` are treated as a single multibyte value. A `FixedString` or a `String` are treated as a single multibyte value.
Bits of a `FixedString` value are lost as they are shifted out. On the contrary a `String` value is extended with additional bytes, so no bits are lost. Bits of a `FixedString` value are lost as they are shifted out. On the contrary a `String` value is extended with additional bytes, so no bits are lost.