Merge pull request #8150 from Unity-Technologies/internal/2021.3/staging

[Port] [2021.3] [Port] [2022.3] DOCG-7032 Add note about emissive decals

Author: UnityAljosha

Packages/com.unity.render-pipelines.high-definition/Documentation~/Ray-Tracing-Getting-Started.md

@@ -271,7 +271,7 @@ There is no support for ray tracing on platforms other than DX12 for now.
 HDRP ray tracing in Unity has the following limitations:
 
 - Doesn't support vertex animation.
-- Doesn't support decals.
+- Doesn't support emissive [Decals](Decal.md). To disable emission, go to the Decal Material Inspector window and disable **Affect Emissive**.
 - Doesn't support Box-shaped spot lights.
 - Doesn't support the volumetric part of the [fog](Override-Fog.md).
 - Doesn't support tessellation.

Packages/com.unity.render-pipelines.high-definition/Documentation~/Ray-Tracing-Path-Tracing.md

@@ -178,7 +178,8 @@ HDRP path tracing in Unity 2020.2 has the following limitations:
   - Tessellation.
   - Tube and Disc-shaped Area Lights.
   - Translucent Opaque Materials.
-  - Several of HDRP's Materials. This includes Eye, Hair, and Decal.
+  - Several of HDRP's Materials. This includes Eye and Hair.
+  - Emissive [Decals](Decal.md). To disable emission, go to the Decal Material Inspector window and disable **Affect Emissive**.
   - Per-pixel displacement (parallax occlusion mapping, height map, depth offset).
   - MSAA.
   - [Graphics.DrawMesh](https://docs.unity3d.com/ScriptReference/Graphics.DrawMesh.html).