small typos and grammar issues on concept-cache-storage page

[cdietschrun]

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• ID: ff097071-85ac-08f3-c191-95c646a795df
• Version Independent ID: 0f6d695c-dd70-a8b6-b759-c7cfa584455f
• Content: Concepts - Cache storage
• Content Source: mip/develop/concept-cache-storage.md
• Service: information-protection
• GitHub Login: @tommoser
• Microsoft Alias: tommos