fixed typo

Yubico.YubiKey/docs/users-manual/application-piv/pin-puk-mgmt-key.md

@@ -38,7 +38,7 @@ specifies that the PUK is to be an 8-byte value, with each of the bytes any bina
 `0xFF` range in the PUK. For YubiKeys with firmware version 5.7 and above, the key will only accept values in the `0x00` -
 `0x7F` range. Values from `0x80` - `0xFF` will be considered invalid by the key, and any attempt to change the PUK to a byte array containing one of these values will fail. 
 
-These restrictions are due to the YubiKey's PUK length requirements: for firmware versions prior to 5.7, the YubiKey simply requires a PUK length of 8 bytes, but for firmware version 5.7 and above, that requirement has changed to 8 *Unicode code points* in length. This is an important change because the byte representation (UTF-8 encoding) of a single code point can be 1-4 bytes in length, which means that an 8-byte PUK may be less than 8 code points. In order to accomodate keys of varying firmware versions, the SDK maintains an 8 byte length requirement when calling [PivSession.TryChangePuk](xref:Yubico.YubiKey.Piv.PivSession.TryChangePuk) or [Piv.Commands.ChangeReferenceDataCommand](xref:Yubico.YubiKey.Piv.Commands.ChangeReferenceDataCommand). However, keys with firmware 5.7 and above will only accept values that represent single-byte code points, hence the restricted range of `0x00` - `0x7F` (the range of `0x80` - `0xFF` represents code points of two bytes in length). For additional information on Unicode, UTF-8, and the SDK, see the [FIDO2 documentation](xref:TheFido2Pin).
+These restrictions are due to the YubiKey's PUK length requirements: for firmware versions prior to 5.7, the YubiKey simply requires a PUK length of 8 bytes, but for firmware version 5.7 and above, that requirement has changed to 8 *Unicode code points* in length. This is an important change because the byte representation (UTF-8 encoding) of a single code point can be 1-4 bytes in length, which means that an 8-byte PUK may be less than 8 code points. In order to accommodate keys of varying firmware versions, the SDK maintains an 8 byte length requirement when calling [PivSession.TryChangePuk](xref:Yubico.YubiKey.Piv.PivSession.TryChangePuk) or [Piv.Commands.ChangeReferenceDataCommand](xref:Yubico.YubiKey.Piv.Commands.ChangeReferenceDataCommand). However, keys with firmware 5.7 and above will only accept values that represent single-byte code points, hence the restricted range of `0x00` - `0x7F` (the range of `0x80` - `0xFF` represents code points of two bytes in length). For additional information on Unicode, UTF-8, and the SDK, see the [FIDO2 documentation](xref:TheFido2Pin).
 
 > [!NOTE]
 > If your application uses the keyboard to insert the PUK, you might limit the user