docs: fix typo in queries page (#1046)

Author: saintwinkle

docs/src/pages/docs/guides/queries.md

@@ -109,7 +109,7 @@ useQuery(['todo', 5], ...)
 
 // And individual todo in a "preview" format
 useQuery(['todo', 5, { preview: true }], ...)
-// queryKey === ['todo', 5, { preview: 'true' } }]
+// queryKey === ['todo', 5, { preview: true }]
 
 // A list of todos that are "done"
 useQuery(['todos', { type: 'done' }], ...)