docs: add signal to queryFn for cancelQueries to work properly (#9475)

Co-authored-by: Jonghyeon Ko <[email protected]>

Author: wilson12365

examples/react/optimistic-updates-cache/src/pages/index.tsx

@@ -20,8 +20,8 @@ type Todos = {
   ts: number
 }
 
-async function fetchTodos(): Promise<Todos> {
-  const response = await fetch('/api/data')
+async function fetchTodos({ signal }: { signal: AbortSignal }): Promise<Todos> {
+  const response = await fetch('/api/data', { signal })
   return await response.json()
 }