Fix for BackpressureUtils method javadoc

Author: artem-zinnatullin

src/main/java/rx/internal/operators/BackpressureUtils.java

@@ -61,9 +61,7 @@ public static <T> long getAndAddRequest(AtomicLongFieldUpdater<T> requested, T o
      * {@code requested} field to {@code Long.MAX_VALUE}.
      * 
      * @param requested
-     *            atomic field updater for a request count
-     * @param object
-     *            contains the field updated by the updater
+     *            atomic long that should be updated
      * @param n
      *            the number of requests to add to the requested count
      * @return requested value just prior to successful addition