BR batch ddl create table description is not correct

[fengou1]

Error 报告

This repository is ONLY used to solve problems related to DOCS-CN.
For other issues (TiDB, TiKV, etc), please move to other repositories.
https://docs.pingcap.com/tidb/dev/br-batch-create-table#use-batch-create-table say
To disable this feature, you can set --ddl-batch-size to 0, it won't disable feature.

Please answer the following questions before submitting your issue. Thanks!

1. What is the document directory for the problem?
   BR

2. How would you like to improve it?
   change description to "To disable this feature, you can set --ddl-batch-size to 1"

[fengou1]

fix by #12274