--Destination flag accepted values fix

Fixed the duplicate accepted values in the docs, HSM and Software was listed twice each respectively.

Author: Lutando

src/KeyVault/KeyVault/help/Add-AzKeyVaultKey.md

@@ -269,7 +269,7 @@ extension, it imports the key as a software-protected key.
 Type: System.String
 Parameter Sets: InteractiveCreate, InputObjectCreate, ResourceIdCreate
 Aliases:
-Accepted values: HSM, Software, HSM, Software
+Accepted values: HSM, Software
 
 Required: True
 Position: Named