ticdc: fix wrong names in bidirectional replication

[hfxsd]

Replaces all instances of 'bi-directional replication' with 'bidirectional replication' across documentation files for consistency. Updates related explanations, configuration references, and limitations to use the unified terminology.

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• This PR is translated from:ticdc: fix wrong names in bidirectional replication docs-cn#21008
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[gemini-code-assist]

Summary of Changes

Hello @hfxsd, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on a documentation refinement to improve consistency and user experience. It systematically replaces all instances of the hyphenated term 'bi-directional replication' with its unhyphenated counterpart, 'bidirectional replication', across various TiDB documentation files. This ensures a unified and professional presentation of the feature, making the documentation easier to navigate and understand.

Highlights

• Terminology Standardization: Standardized the term 'bi-directional replication' to 'bidirectional replication' across all relevant documentation files. This change ensures consistent terminology throughout the TiDB documentation, improving clarity and readability for users.

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[gemini-code-assist]

Code Review

This pull request consistently replaces 'bi-directional replication' with 'bidirectional replication' across several documentation files, which improves terminology consistency. The changes are mostly correct. I've added a few suggestions to fix a potentially confusing instruction and improve stylistic consistency in one of the files.

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