Minor wording change in error message for Try().peek(Consumer, Consumer) (#2661)

Author: sleepytomcat

src/main/java/io/vavr/control/Try.java

@@ -895,8 +895,8 @@ public final <X> X fold(Function<? super Throwable, ? extends X> ifFail, Functio
      * @return this {@code Try}
      */
     public final Try<T> peek(Consumer<? super Throwable> failureAction, Consumer<? super T> successAction) {
-        Objects.requireNonNull(failureAction, "action is null");
-        Objects.requireNonNull(successAction, "action is null");
+        Objects.requireNonNull(failureAction, "failureAction is null");
+        Objects.requireNonNull(successAction, "successAction is null");
 
         if (isFailure()) {
             failureAction.accept(getCause());