ADHOC: updates docs for OC Assets API

[Bug-0xFF]

Changes

Update the description of OC Assets GetAsset() endpoint

Checks

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[github-actions]

Hi @Bug-0xFF, 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.