tidbcloud: Update FLASHBACK CLUSTER TO warning for instance tiers

[YuJuncen]

Corrected the warning regarding the applicability of the FLASHBACK CLUSTER TO syntax to include premium instances.

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[gemini-code-assist]

Code Review

This pull request updates the documentation to specify that the FLASHBACK CLUSTER TO [TIMESTAMP|TSO] syntax is not applicable to premium instances. The review feedback correctly identifies a typo ('abd' instead of 'and') and suggests using an Oxford comma for consistency and readability, providing a helpful code suggestion.

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