Update variable names

[FeudalDiana]

Changes

Fixed names to match official Roblox Lua Styling guide for consistency.

https://roblox.github.io/lua-style-guide/#naming

Checks

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[github-actions]

Hi @FeudalDiana, 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.