DATAREDIS-680 - Fix Javadoc references on ZSet score methods.

Point to the correct method in the Redis documentation.

Original pull request: #265.

src/main/java/org/springframework/data/redis/core/ZSetOperations.java

@@ -284,7 +284,7 @@ public interface ZSetOperations<K, V> {
 	 * @param key must not be {@literal null}.
 	 * @param o the value.
 	 * @return
-	 * @see <a href="http://redis.io/commands/zrem">Redis Documentation: ZREM</a>
+	 * @see <a href="http://redis.io/commands/zscore">Redis Documentation: ZSCORE</a>
 	 */
 	Double score(K key, Object o);