made the subscribe description clearer

Author: D-K-P

docs/realtime/react-hooks/subscribe.mdx

@@ -206,8 +206,8 @@ See our [Realtime documentation](/realtime) for more information.
 All realtime hooks automatically include metadata updates. Whenever your task updates metadata using `metadata.set()`, `metadata.append()`, or other metadata methods, your component will re-render with the updated data.
 
 <Note>
-  To learn how to update metadata from your tasks, see our [backend metadata
-  documentation](/realtime/backend/metadata).
+  To learn how to write tasks that use metadata, see our [writing tasks using
+  metadata](/runs/metadata) guide.
 </Note>
 
 ### Progress monitoring