fix: typo in Update 04-v4-migration-guide.md

[richardwilkes]

Svelte 5 rewrite

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[Conduitry]

'outroing' is the intended word - #2495 #4147 #8810 #8819

[richardwilkes]

Odd, but OK. Given that this is the fifth PR attempting to fix what folks perceive to be a typo, it might be better if a more well-known term is used.