add note on which issue SSR is skipped for

test/runtime/samples/reactive-assignment-in-complex-declaration-with-store-2/_config.js

@@ -1,6 +1,6 @@
 // destructure to store value
 export default {
-	skip_if_ssr: true,
+	skip_if_ssr: true, // pending https://github.com/sveltejs/svelte/issues/3582
 	html: `<h1>2 2 xxx 5 6 9 10 2</h1>`,
 	async test({ assert, target, component }) {
 		await component.update();