Sync svelte docs (#1271)

sync svelte docs

Co-authored-by: svelte-docs-bot[bot] <196124396+svelte-docs-bot[bot]@users.noreply.github.com>

Author: github-actions[bot]

apps/svelte.dev/content/docs/svelte/06-runtime/02-context.md

@@ -95,7 +95,7 @@ interface User {}
 // ---cut---
 import { getContext, setContext } from 'svelte';
 
-let key = {};
+const key = {};
 
 /** @param {User} user */
 export function setUserContext(user) {