Fix error in cache duration. (#811)

src/routes/solid-router/reference/data-apis/cache.mdx

@@ -67,7 +67,7 @@ export default function User(props) {
 `cache` accomplishes the following:
 
 1. Deduping on the server for the lifetime of the request.
-2. Preloading the cache in the browser - this lasts 10 seconds.
+2. Preloading the cache in the browser - this lasts 5 seconds.
    When a route is preloaded on hover or when load is called when entering a route it will make sure to dedupe calls.
 3. A reactive refetch mechanism based on key.
    This prevents routes that are not new from retriggering on action revalidation.