docs: correct .refresh() example

[Sendouc]

Seems like .refresh() returns a Promise and if you are not awaiting it the single-flight mutation does not work. Adding the await makes it work in my testing so might just be a typo in docs.

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Preview: https://svelte-dev-git-preview-kit-14090-svelte.vercel.app/

[eltigerchino]

Thank you! You're right. It does require the await (at least that's what I gather from looking at the SvelteKit test for this).