fix(reference): declare subscribe before passing it to the hook (issue #7707)

[hugmouse]

Fixes the typo in the docs, related issue: #7707

Context from the issue

The following code will throw Uncaught TypeError: subscribe is not a function.

react.dev/src/content/reference/react/useSyncExternalStore.md

Lines 438 to 447 in b5f5134

	function ChatIndicator({ userId }) {
	const isOnline = useSyncExternalStore(subscribe, getSnapshot);
	// ✅ Same function as long as userId doesn't change
	const subscribe = useCallback(() => {
	// ...
	}, [userId]);
	// ...
	}

Documentation page: https://react.dev/reference/react/useSyncExternalStore#my-subscribe-function-gets-called-after-every-re-render

Fix

Just declaring subscribe before passing it to the hook.

Screenshot

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[rickhanlonii]

great thanks!