optimization error hint for top range

hugegraph-core/src/main/java/com/baidu/hugegraph/traversal/algorithm/NeighborRankTraverser.java

@@ -244,7 +244,7 @@ public static class Step {
         public Step(HugeGraph g, Directions direction, List<String> labels,
                     long degree, long skipDegree, int top, int capacity) {
             E.checkArgument(top > 0 && top <= MAX_TOP,
-                            "The top of each layer can't exceed %s", MAX_TOP);
+                            "The top of each layer muse be in (0, %s]", MAX_TOP);
             E.checkArgument(capacity > 0,
                             "The capacity of each layer must be > 0, " +
                             "but got %s", capacity);