Fix typo in content source type docs

[gaymeowing]

Changes

Fixes a typo in the content source type docs where url was spelt "uri"

Checks

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[github-actions]

Hi @witchiestwitchery, 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.