Updated doc for the newly added debug mode for cluster display.

com.unity.render-pipelines.high-definition/Documentation~/Render-Pipeline-Debug-Window.md

@@ -148,6 +148,8 @@ The **Lighting** panel has tools that you can use to visualize various component
 | **Fullscreen Debug Mode**            | Use the drop-down to select a fullscreen lighting effect to debug. For example, you can visualize [Contact Shadows](Override-Contact-Shadows.md), the depth pyramid, and indirect diffuse lighting. |
 | **Tile/Cluster Debug**               | Use the drop-down to select an internal HDRP lighting structure to visualize on screen.<br/>&#8226; **None**: Select this option to turn off this debug feature.<br/>&#8226; **Tile**: Select this option to show an overlay of each lighting tile, and the number of lights in them.<br/>&#8226; **Cluster**: Select this option to show an overlay of each lighting cluster that intersects opaque geometry, and the number of lights in them.<br/>&#8226; **Material Feature Variants**: Select this option to show the index of the lighting Shader variant that HDRP uses for a tile. You can find variant descriptions in the *lit.hlsl* file. |
 | **- Tile/Cluster Debug By Category** | Use the drop-down to select the Light type that you want to show the Tile/Cluster debug information for. The options include [Light Types](Light-Component.md), [Decals](Decal-Projector.md), and [Density Volumes](Density-Volume.md).<br/>This property only appears when you select **Tile** or **Cluster** from the **Tile/Cluster Debug** drop-down. |
+| **- Cluster Debug Mode** | Use the drop-down to select the visualization mode for the cluster. The options are:<br/> **VisualizeOpaque**: Shows cluster information on opaque geometry.<br/> **VisualizeSlice**: Shows cluster information at a set distance from the camera.<br/>This property only appears when you select **Cluster** from the **Tile/Cluster Debug** drop-down.. |
+| **- Cluster Distance** | Use this slider to set the distance from the camera at which to display the cluster slice. This property only appears when you select **VisualizeSlice** from the **Cluster Debug Mode** drop-down. |
 | **Display Sky Reflection**           | Enable the checkbox to display an overlay of the cube map that the current sky generates and HDRP uses for lighting. |
 | **- Sky Reflection Mipmap**          | Use the slider to set the mipmap level of the sky reflection cubemap. Use this to view the sky reflection cubemap's different mipmap levels.<br/>This property only appears when you enable the **Display Sky Reflection** checkbox. |
 | **Display Light Volumes**            | Enable the checkbox to show an overlay of all light bounding volumes. |