docs: update alter column fulltext options

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What's Changed in this PR

Add docs for alter column fulltext options. Waiting for https://github.com/GreptimeTeam/greptimedb/pull/4952

Close #1277

Checklist

• [ ] Please confirm that all corresponding versions of the documents have been revised.
• [ ] Please ensure that the content in sidebars.ts matches the current document structure when you changed the document structure.
• [ ] This change requires follow-up update in localized docs.

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