Updated What's new doc

All new additions and images included.
Unity-Technologies · sebastienlagarde · Sep 21, 2021 · Sep 21, 2021 · Sep 21, 2021 · 9db72a9423a75d0bf9396fbc2349e0f0f8b78745
commit 9db72a9423a75d0bf9396fbc2349e0f0f8b78745
diff --git a/...nity.render-pipelines.high-definition/Documentation~/Images/FidelityFX-Menu.png b/...nity.render-pipelines.high-definition/Documentation~/Images/FidelityFX-Menu.png
diff --git a/...ty.render-pipelines.high-definition/Documentation~/Images/LensFlareTextures.png b/...ty.render-pipelines.high-definition/Documentation~/Images/LensFlareTextures.png
diff --git a/com.unity.render-pipelines.high-definition/Documentation~/Images/PBHairShader.png b/com.unity.render-pipelines.high-definition/Documentation~/Images/PBHairShader.png
diff --git a/...unity.render-pipelines.high-definition/Documentation~/Images/ProbeVolumesGI.png b/...unity.render-pipelines.high-definition/Documentation~/Images/ProbeVolumesGI.png
diff --git a/com.unity.render-pipelines.high-definition/Documentation~/Images/SSGIoff.png b/com.unity.render-pipelines.high-definition/Documentation~/Images/SSGIoff.png
diff --git a/com.unity.render-pipelines.high-definition/Documentation~/Images/SSGIon.png b/com.unity.render-pipelines.high-definition/Documentation~/Images/SSGIon.png
diff --git a/...ty.render-pipelines.high-definition/Documentation~/Images/SpecularOcclusion.png b/...ty.render-pipelines.high-definition/Documentation~/Images/SpecularOcclusion.png
diff --git a/com.unity.render-pipelines.high-definition/Documentation~/Images/UseMipBias.png b/com.unity.render-pipelines.high-definition/Documentation~/Images/UseMipBias.png
diff --git a/com.unity.render-pipelines.high-definition/Documentation~/whats-new-12.md b/com.unity.render-pipelines.high-definition/Documentation~/whats-new-12.md