Update docs/book/src/reference/watching-resources.md

docs/book/src/reference/watching-resources.md

@@ -113,7 +113,7 @@ impact the primary resource and your controller's functionality.
 Here are the key reasons why it's important to watch them:
 
 - **Ensuring Consistency**:
-    - Secondary resources (e.g., child objects or external dependencies) may diverge from their expected state.
+    - Secondary resources (e.g., child objects or external dependencies) may diverge from their desired state.
     For instance, a secondary resource may be modified or deleted, causing the system to fall out of sync.
     - Watching secondary resources ensures that any changes are detected immediately, allowing the controller to
     reconcile and restore the desired state.