ticdc: add ddl detail to bidirectional replication doc

[ran-huang]

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• v7.2 (TiDB 7.2 versions)
• v7.1 (TiDB 7.1 versions)
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What is the related PR or file link(s)?

• This PR is translated from: ticdc: add ddl detail to bidirectional replication doc docs-cn#13908
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-06-28 08:22:18.400644209 +0000 UTC m=+782303.801894642: ☑️ agreed by Oreoxmt.

[ran-huang]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ran-huang

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #14027.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.6: #14028.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.0: #14029.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #14030.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.2: #14031.