Update SpawnerService.yaml

[cosinewaves]

Changed the summary and description as "for the behaviour or" doesn't gramatically make sense.

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[github-actions]

Hi @adnanelkha, 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.

[aetter]

Thanks @adnanelkha!