2.x: Clarify behavior of RxJavaPlugins.reset() in javadoc (#4298)

Author: artem-zinnatullin

src/main/java/io/reactivex/plugins/RxJavaPlugins.java

@@ -231,7 +231,7 @@ public static Scheduler onSingleScheduler(Scheduler defaultScheduler) {
     }
 
     /**
-     * Removes all handlers and resets the default behavior.
+     * Removes all handlers and resets to default behavior.
      */
     public static void reset() {
         setErrorHandler(null);