dispatcher: fix missing javadoc @param

Author: abarisain

atinternet-dispatcher/src/main/java/com/batch/android/dispatcher/atinternet/AtInternetDispatcher.java

@@ -86,6 +86,8 @@ public void dispatchEvent(@NonNull Batch.EventDispatcher.Type type,
      If set to null (its default value), Batch will automatically instantiate its own trackers
      using the default configuration.
      This method is useful if you set your {@link Tracker} instances in your code.
+
+     @param trackerOverride Tracker instance to use. null if Batch should use its default one.
      */
     public void setTrackerOverride(@Nullable Tracker trackerOverride) {
         this.trackerOverride = trackerOverride;