Prepare the project for javadocs

src/main/java/fr/xephi/authme/security/pbkdf2/PRF.java

@@ -48,14 +48,14 @@ public interface PRF {
      * @param M
      *            Input data/message etc. Together with any data supplied during
      *            initilization.
-     * @return Random bytes of hLen length.
-     */
+    
+     * @return Random bytes of hLen length. */
     public byte[] doFinal(byte[] M);
 
     /**
      * Query block size of underlying algorithm/mechanism.
      * 
-     * @return block size
-     */
+    
+     * @return block size */
     public int getHLen();
 }