feat(log): optimize checkpointV2 check tips (#5383)

Author: lurais

chainbase/src/main/java/org/tron/core/db2/core/SnapshotManager.java

@@ -493,7 +493,9 @@ public void check() {
     if (!isV2Open()) {
       List<String> cpList = getCheckpointList();
       if (cpList != null && cpList.size() != 0) {
-        logger.error("checkpoint check failed, can't convert checkpoint from v2 to v1");
+        logger.error("checkpoint check failed, the checkpoint version of database not match your " +
+            "config file, please set storage.checkpoint.version = 2 in your config file " +
+            "and restart the node.");
         System.exit(-1);
       }
       checkV1();