Docs: SerializationPluginProtocol example is cut off

[JacobCoffee]

Summary

It seems the source has changed (https://docs.advanced-alchemy.litestar.dev/latest/reference/extensions/litestar/plugins/serialization.html#advanced_alchemy.extensions.litestar.plugins.serialization.SQLAlchemySerializationPlugin.supports_type) and the example is missing quite a bit:

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