Update Surface-Type.md (#6384)

Author: sebastienlagarde

com.unity.render-pipelines.high-definition/Documentation~/Surface-Type.md

@@ -23,8 +23,8 @@ If you set the **Surface Type** to **Transparent**, HDRP exposes options to set
 | **Sorting Priority**                  | Allows you to change the rendering order of overlaid transparent surfaces. For more information and an example of usage, see the [Material sorting documentation](Renderer-And-Material-Priority.md#SortingByMaterial). |
 | **Receive fog**                       | Enable the checkbox to allow fog to affect the transparent surface. When disabled, HDRP does not take this Material into account when it calculates the fog in the Scene. |
 | **Back Then Front Rendering**         | Enable the checkbox to make HDRP render this Material in two separate draw calls. HDRP renders the back face in the first draw call and the front face in the second. |
-| **Transparent depth prepass**         | Enable the checkbox to add polygons from the transparent surface to the depth buffer to improve their sorting. HDRP performs this operation before the lighting pass and this process improves GPU performance. |
-| **Transparent depth postpass**        | Enable the checkbox to add polygons to the depth buffer that post-processing uses. HDRP performs this operation before the lighting pass. Enabling this feature is useful if you want to use post-processing effects that use depth information, like [motion blur](Post-Processing-Motion-Blur.md) or [depth of field](Post-Processing-Depth-of-Field.md). |
+| **Transparent depth prepass**         | Enable the checkbox to add polygons from the transparent surface to the depth buffer to improve their sorting. HDRP performs this operation before the transparent lighting pass. |
+| **Transparent depth postpass**        | Enable the checkbox to add polygons from the transparent surface to the depth buffer so they affect post-processing. HDRP performs this operation after the lighting pass. Enabling this feature is useful when using post-processing effects that use depth information, like [motion blur](Post-Processing-Motion-Blur.md) or [depth of field](Post-Processing-Depth-of-Field.md). |
 | **Transparent Writes Motion Vectors** | Enable the checkbox to make HDRP write motion vectors for transparent GameObjects that use this Material. This allows HDRP to process effects like motion blur for transparent objects. For more information on motion vectors, see the [motion vectors documentation](Motion-Vectors.md). |
 | **Depth Write**                       | Enable the checkbox to make HDRP write depth values for transparent GameObjects that use this Material. |
 | **Depth Test**                        | Use the drop-down to select the comparison function to use for the depth test. |