tidb-cloud: add a note about Dedicated cluster creation time

[lilin90]

What is changed, added or deleted? (Required)

Added a note for the creation time of Dedicated clusters.

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[ti-chi-bot]

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[gemini-code-assist]

Summary of Changes

Hello @lilin90, 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 improves the clarity of the TiDB Cloud documentation regarding the creation process for Dedicated clusters. It addresses potential user confusion by explicitly stating that cluster provisioning times can fluctuate based on geographical region and may occasionally extend beyond the typical 20-30 minute estimate. The update also provides clear guidance on when and how to seek support if delays occur, enhancing the user experience by setting more accurate expectations and offering a path for assistance.

Highlights

• Documentation Update: Added a note to the create-tidb-cluster.md documentation, clarifying that TiDB Cloud Dedicated cluster creation times can vary by region and may exceed 30 minutes.
• User Guidance: Included instructions for users to contact TiDB Cloud Support if cluster creation takes significantly longer than expected.
• Notification Clarity: Enhanced the description of the cluster creation process to mention that the TiDB Cloud console sends a notification upon completion.

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[gemini-code-assist]

Code Review

This pull request adds a helpful note to the documentation regarding the creation time for Dedicated TiDB clusters. It clarifies that creation time can vary by region and provides guidance on what to do if it takes longer than expected. My review includes a suggestion to rephrase the new content slightly for better clarity and conciseness, following the repository's documentation style guide.

[lilin90]

@nicole-yc PTAL

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-01-16 08:10:00.430832209 +0000 UTC m=+135828.044789055: ☑️ agreed by qiancai.