Fix Javadoc

Author: kwwall

src/main/java/org/owasp/esapi/crypto/CipherText.java

@@ -804,7 +804,8 @@ protected boolean canEqual(Object other) {
      * proved in 1996 [see http://pssic.free.fr/Extra%20Reading/SEC+/SEC+/hmac-cb.pdf] that
      * HMAC security doesn’t require that the underlying hash function be collision resistant,
      * but only that it acts as a pseudo-random function, which SHA1 satisfies.
-     * @param ciphertext    The ciphertext value for which the MAC is computed.
+     * @param authKey    The {@Code SecretKey} used with the computed HMAC-SHA1
+     * to ensure authenticity.
      * @return The value for the MAC.
      */ 
     private byte[] computeMAC(SecretKey authKey) {