cloud: update the support info of fulltext syntax (#21967)

[ti-chi-bot]

This is an automated cherry-pick of #21967

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What is changed, added or deleted? (Required)

Add notes to clarify the availability of FULLTEXT syntax and indexes for different product options.

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[gemini-code-assist]

Summary of Changes

Hello @ti-chi-bot, 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 enhances the clarity of documentation regarding FULLTEXT search capabilities within TiDB. It provides precise details on which TiDB deployment options (e.g., Cloud Starter/Essential vs. Self-Managed/Dedicated) fully support FULLTEXT indexes, ensuring users have accurate expectations about this feature's availability and limitations.

Highlights

• Clarified FULLTEXT Index Support: Detailed information has been added regarding the availability and limitations of FULLTEXT syntax and indexes across different TiDB product options, ensuring users understand where this feature is fully supported.
• Specific Product Availability: The documentation now explicitly states that FULLTEXT indexes are only fully supported in {{{ .starter }}} and {{{ .essential }}} clusters within specific AWS regions.
• Parsing vs. Usage Distinction: The updated content clearly differentiates between parsing FULLTEXT syntax (which is supported by TiDB Self-Managed and TiDB Cloud Dedicated) and actually using FULLTEXT indexes (which is not supported by these versions).

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[gemini-code-assist]

Code Review

This pull request updates the documentation to clarify the support for FULLTEXT syntax and indexes across different TiDB product offerings. The changes are accurate and helpful. I've provided a few minor suggestions to improve grammar and conciseness, in line with the repository's style guide.

[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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[ti-chi-bot]

In response to a cherrypick label: base branch (master) needs to differ from target branch (master).