docs(react-query): fix typo whan -> when (#6929)

docs/framework/react/guides/advanced-ssr.md

@@ -359,7 +359,7 @@ As an aside, in the future it might be possible to skip the await for "optional"
 
 While we recommend the prefetching solution detailed above because it flattens request waterfalls both on the initial page load **and** any subsequent page navigation, there is an experimental way to skip prefetching altogether and still have streaming SSR work: `@tanstack/react-query-next-experimental`
 
-This package will allow you to fetch data on the server (in a Client Component) by just calling `useSuspenseQuery` in your component. Results will then be streamed from the server to the client as SuspenseBoundaries resolve. If you call `useSuspenseQuery` without wrapping it in a `<Suspense>` boundary, the HTML response won't start until the fetch resolves. This can be whan you want depending on the situation, but keep in mind that this will hurt your TTFB.
+This package will allow you to fetch data on the server (in a Client Component) by just calling `useSuspenseQuery` in your component. Results will then be streamed from the server to the client as SuspenseBoundaries resolve. If you call `useSuspenseQuery` without wrapping it in a `<Suspense>` boundary, the HTML response won't start until the fetch resolves. This can be when you want depending on the situation, but keep in mind that this will hurt your TTFB.
 
 To achieve this, wrap your app in the `ReactQueryStreamedHydration` component: