Update decryptor.h

in the current comment is mentioned that an exception of type std::invalid_argument will be thrown if scheme is not BFV which is not the case in encryptor.cpp (BGV is supported as well), also the exception is logic_error

Author: Imad Chabounia

native/src/seal/decryptor.h

@@ -92,7 +92,7 @@ namespace seal
         becomes too noisy to decrypt correctly.
 
         @param[in] encrypted The ciphertext
-        @throws std::invalid_argument if the scheme is not BFV
+        @throws std::invalid_argument if the scheme is not BFV/BGV
         @throws std::invalid_argument if encrypted is not valid for the encryption
         parameters
         @throws std::invalid_argument if encrypted is in NTT form