docs(ja): fix region/health translations in inspection result and information schema

[yahonda]

Fix literal translations of technical terms to standard katakana forms used in TiDB:

information-schema-inspection-result.md:

• 地域スコアバランス → リージョンスコアバランス
• 店舗利用可能残高 → ストア利用可能残高
• 地域数 → リージョン数
• 地域の健康 → リージョンのヘルス

information-schema.md:

• どの地域が暑いか → どのリージョンがホットか
• どの地域が人気が高いか → どのリージョンがホットか
• 地域に関する統計情報 → リージョンに関する統計情報
• どのリージョンが人気が高いか → どのリージョンがホットか

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[gemini-code-assist]

Code Review

This pull request standardizes Japanese terminology in the information schema documentation, primarily replacing "地域" with "リージョン" (Region) and "店舗" with "ストア" (Store). The review feedback suggests further improvements for consistency and style, such as translating "storage" to "ストレージ" and rephrasing passive verbs like "期待されます" and "予想されます" to "想定されています" to align with technical writing guidelines.

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