cloud: update AWS regions for full-text search availability

[guangleibao]

Update AWS regions for full-text search availability to align with the 2025-06-09 release notes.

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[gemini-code-assist]

Code Review

This pull request updates the hybrid search documentation to include the N.Virginia (us-east-1) region in the list of supported AWS regions for full-text search. The review feedback suggests formatting this as N. Virginia with a space to follow standard naming conventions and improve readability.

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