docs: Make transition global in Deferred transition example

[Posandu]

Svelte 4 uses local for transitions by default. changelog. Therefore, the deferred transition example doesn't work. I fixed it

Before

Recording.2023-07-21.224422.mp4

After

Recording.2023-07-21.224422.mp4

[changeset-bot]

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Latest commit: 9aaab44

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[geoffrich]

Thanks!