docs: Update 0.9.9.md

Author: makspll

release-notes/0.9.9.md

@@ -3,8 +3,7 @@
 ![image](https://github.com/user-attachments/assets/6ae0f927-ea1b-4d90-a809-4cc513e49b18)
 
 ## Summary 
-- Dynamic Systems are here! [^1]
-    - it's now possible to query schedules, systems, and inject new event handlers from scripts themselves:
+- Dynamic Systems are here! [^1]. it's now possible to query schedules, systems, and inject new event handlers from scripts themselves:
   ```lua
     local post_update_schedule = world.get_schedule_by_name("PostUpdate")
 
@@ -16,11 +15,9 @@
             :after(test_system)
     )
 
-    local system_before = world.add_system(
-        post_update_schedule,
-        system_builder("custom_system_before", script_id)
-            :before(test_system)
-    )
+    function custom_system_after()
+        print("i will run after the existing system in PostUpdate!")
+    end
   ```
 - `WithWorldGuard` and `HandlerContext<Plugin>` system parameters can be used in conjunction to create custom event handler systems
    ```rust