Update observability.md, minor title typo

[jwinterRBLX]

Changed from "memory store" to "Memory Stores"

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[github-actions]

Hi @jwinterRBLX, thanks so much for helping improve the Roblox creator documentation! Our technical writing team will review your pull request soon. In the meantime, please ensure you've read through the README.md, contribution guidelines, and style recommendations.

[IgnisRBX]

Suggested change

	title: Memory Stores observability
	title: Memory stores observability

[IgnisRBX]

Unless referring to a specific proper tool like "Asset Manager" or "Creator Marketplace," we do titles in sentence case now. Happy to add the "s" if you'd like... :)