配置文件没有包含双向复制的参数--bdr-mode

[longlongago7777]

File: /release-7.5/ticdc/ticdc-changefeed-config.md

是否启用 bdr 双向复制

bdr-mode = true

配置文件没有包含双向复制的参数，参考：https://docs.pingcap.com/zh/tidb/stable/ticdc-bidirectional-replication

[Oreoxmt]

@asddongmen Could you please take a look at this issue and create a pull request to update the document? Thanks!

[danqixu]

@Oreoxmt Could you please assign this issue to me?