fix variable format issues (#22008)

[ti-chi-bot]

This is an automated cherry-pick of #22008

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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 addresses a minor formatting inconsistency within the documentation. It specifically targets the variable placeholders used for starter and essential clusters, ensuring consistent rendering across various SQL statement and compatibility guides. This change improves the overall readability and accuracy of the documentation by fixing a subtle spacing issue.

Highlights

• Documentation Formatting: Corrected a minor formatting inconsistency in variable placeholders ({{{ .starter }}} and {{{ .essential }}}) across multiple documentation files to ensure consistent rendering.

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[gemini-code-assist]

Code Review

This pull request fixes minor formatting issues with template variables across several documentation files. The changes are correct and improve rendering consistency. I've also added a few suggestions to consolidate related information about FULLTEXT index support, making the documentation clearer and more consistent.

[gemini-code-assist]

To improve clarity, consider converting this note into a standalone bullet point. This makes the information about FULLTEXT support on TiDB Cloud more prominent and easier to read.

Suggested change

	>**Note:**
	>
	> Currently, only {{{ .starter }} and {{{ .essential }}} clusters in certain AWS regions support [`FULLTEXT` syntax and indexes](https://docs.pingcap.com/tidbcloud/vector-search-full-text-search-sql).
	> Currently, only {{{ .starter }}} and {{{ .essential }}} clusters in certain AWS regions support [`FULLTEXT` syntax and indexes](https://docs.pingcap.com/tidbcloud/vector-search-full-text-search-sql).
	* For TiDB Cloud, only {{{ .starter }}} and {{{ .essential }}} clusters in certain AWS regions support [`FULLTEXT` syntax and indexes](https://docs.pingcap.com/tidbcloud/vector-search-full-text-search-sql).

[gemini-code-assist]

To improve clarity, consider converting this note into a standalone bullet point. This makes the information about FULLTEXT support on TiDB Cloud more prominent and easier to read.

Suggested change

	>**Note:**
	>
	> Currently, only {{{ .starter }} and {{{ .essential }}} clusters in certain AWS regions support [`FULLTEXT` syntax and indexes](https://docs.pingcap.com/tidbcloud/vector-search-full-text-search-sql).
	> Currently, only {{{ .starter }}} and {{{ .essential }}} clusters in certain AWS regions support [`FULLTEXT` syntax and indexes](https://docs.pingcap.com/tidbcloud/vector-search-full-text-search-sql).
	* For TiDB Cloud, only {{{ .starter }}} and {{{ .essential }}} clusters in certain AWS regions support [`FULLTEXT` syntax and indexes](https://docs.pingcap.com/tidbcloud/vector-search-full-text-search-sql).

[gemini-code-assist]

To improve clarity and consistency with other documentation pages, consider consolidating the information about FULLTEXT index support into a single, more comprehensive bullet point. This avoids splitting the information between a list item and a note.

Suggested change

	>**Note:**
	>
	> Currently, only {{{ .starter }} and {{{ .essential }}} clusters in certain AWS regions support [`FULLTEXT` syntax and indexes](https://docs.pingcap.com/tidbcloud/vector-search-full-text-search-sql).
	> Currently, only {{{ .starter }}} and {{{ .essential }}} clusters in certain AWS regions support [`FULLTEXT` syntax and indexes](https://docs.pingcap.com/tidbcloud/vector-search-full-text-search-sql).
	* Setting a `PRIMARY KEY` or `UNIQUE INDEX` as a [global index](/partitioned-table.md#global-indexes) with the `GLOBAL` index option is a TiDB extension for [partitioned tables](/partitioned-table.md) and is not compatible with MySQL.
	* `FULLTEXT` indexes have different levels of support across TiDB offerings:
	* TiDB Self-Managed and TiDB Cloud Dedicated support parsing the `FULLTEXT` syntax but do not support using `FULLTEXT` indexes.
	* For TiDB Cloud, only {{{ .starter }}} and {{{ .essential }}} clusters in certain AWS regions support [`FULLTEXT` syntax and indexes](https://docs.pingcap.com/tidbcloud/vector-search-full-text-search-sql).