cloud: update the supported AWS regions for full-text search on Starter

[guangleibao]

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Code Review

This pull request updates the list of supported AWS regions for the full-text search feature in the SQL guide to include Oregon and Tokyo. The reviewer suggests updating other related documentation files for consistency and recommends adding an Oxford comma for better readability.

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Timeline:

• 2026-05-26 08:54:53.329086985 +0000 UTC m=+342363.299252039: ☑️ agreed by hfxsd.