updated comments for jwe service.

openid-connect-common/src/main/java/org/mitre/jwt/encryption/service/JwtEncryptionAndDecryptionService.java

@@ -31,12 +31,16 @@ public interface JwtEncryptionAndDecryptionService {
 
 	/**
 	 * Encrypts the JWT in place with the default encrypter. 
+	 * If an arbitrary payload is used, then pass in a JWEObject. 
+	 * Otherwise, if JWT claims are the payload, then use the JWEObject subclass EncryptedJWT instead.
 	 * @param jwt
 	 */
 	public void encryptJwt(JWEObject jwt);
 	
 	/**
 	 * Decrypts the JWT in place with the default decrypter. 
+	 *  If an arbitrary payload is used, then pass in a JWEObject. 
+	 *  Otherwise, if JWT claims are the payload, then use the JWEObject subclass EncryptedJWT instead.
 	 * @param jwt
 	 */
 	public void decryptJwt(JWEObject jwt);