one console: update "TiDB instances" to avoid misunderstanding

[qiancai]

… FAQs for consistency across TiDB Cloud documentation

First-time contributors' checklist

• I've signed the Contributor License Agreement, which is required for the repository owners to accept my contribution.

What is changed, added or deleted? (Required)

• Replace “TiDB instances” with “TiDB nodes” where “TiDB instances” actually refers to TiDB nodes.
• Remove “All TiDB instances” from tidb-cloud/premium/built-in-monitoring-premium.md, because in this context it refers to the current TiDB Cloud Premium instance and is therefore redundant.

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For details, see tips for choosing the affected versions.

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)

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Do your changes match any of the following descriptions?

• Delete files
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[gemini-code-assist]

Summary of Changes

Hello, 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 enhancing the precision and uniformity of the documentation by standardizing the terminology used to refer to TiDB components. The primary change involves replacing 'TiDB instances' with 'TiDB nodes' to prevent potential misunderstandings and ensure a consistent vocabulary throughout the guides. Additionally, descriptions for monitoring metrics and a navigation tip have been refined to reflect these changes and improve overall readability.

Highlights

• Terminology Update: Updated instances of 'TiDB instances' to 'TiDB nodes' across multiple documentation files for improved clarity and consistency.
• Monitoring Metrics Descriptions: Refined descriptions for various monitoring metrics in built-in monitoring, Datadog, and New Relic integration guides to use the updated terminology and remove redundant phrases.
• Navigation Tip Enhancement: Expanded a tip in the premium built-in monitoring guide to clarify that the combo box can switch between organizations, projects, and resources.

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[gemini-code-assist]

Code Review

This pull request updates the term 'TiDB instances' to 'TiDB nodes' across several documentation files to improve terminological consistency. The changes also include refining metric descriptions for premium-tier clusters to better abstract underlying infrastructure details. The updates are accurate and improve the documentation's clarity. I have one minor suggestion to rephrase a metric description for better readability and consistency.