DOCG-4786 Fix code sample

com.unity.postprocessing/Documentation~/Manipulating-the-Stack.md

@@ -7,37 +7,41 @@ This guide explains how to modify a post-processing script to create time-based
 Use the `QuickVolume` method to quickly spawn new volumes in the scene, to create time-based events or temporary states:
 
 ```csharp
-[
 public PostProcessVolume QuickVolume(int layer, float priority, params PostProcessEffectSettings[] settings)
-]
 ```
 The following example demonstrates how to use a script to create a pulsating vignette effect:
 
 ```csharp
-[
 using UnityEngine;
 using UnityEngine.Rendering.PostProcessing;
+
 public class VignettePulse : MonoBehaviour
 {
-   PostProcessVolume m_Volume;
-   Vignette m_Vignette
-   void Start()
+  PostProcessVolume m_Volume;
+  Vignette m_Vignette;
+
+  void Start()
   {
       // Create an instance of a vignette
-       m_Vignette = ScriptableObject.CreateInstance<Vignette>();
-       m_Vignette.enabled.Override(true);
-       m_Vignette.intensity.Override(1f);
+      m_Vignette = ScriptableObject.CreateInstance<Vignette>();
+      m_Vignette.enabled.Override(true);
+      m_Vignette.intensity.Override(1f);
+
       // Use the QuickVolume method to create a volume with a priority of 100, and assign the vignette to this volume
-       m_Volume = PostProcessManager.instance.QuickVolume(gameObject.layer, 100f, m_Vignette);
-   void Update()
+      m_Volume = PostProcessManager.instance.QuickVolume(gameObject.layer, 100f, m_Vignette);
+  }
+
+  void Update()
   {
        // Change vignette intensity using a sinus curve
-        m_Vignette.intensity.value = Mathf.Sin(Time.realtimeSinceStartup);
+      m_Vignette.intensity.value = Mathf.Sin(Time.realtimeSinceStartup);
   }
-   void OnDestroy()
+
+  void OnDestroy()
   {
-       RuntimeUtilities.DestroyVolume(m_Volume, true, true);
+      RuntimeUtilities.DestroyVolume(m_Volume, true, true);
   }
+
 }
 ```