just fix some comments in our normal mapping stuff

just fix some comments in our normal mapping stuff

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitData.hlsl

 
     float3 sigmaX = dPdx - dot(dPdx, vertexNormalWS) * vertexNormalWS;
     float3 sigmaY = dPdy - dot(dPdy, vertexNormalWS) * vertexNormalWS;
-    //float flipSign = dot(sigmaY, cross(nrmVertexNormal, sigmaX) ) ? -1.0 : 1.0;
+    //float flipSign = dot(sigmaY, cross(vertexNormalWS, sigmaX) ) ? -1.0 : 1.0;
     float flipSign = dot(dPdy, cross(vertexNormalWS, dPdx)) < 0.0 ? -1.0 : 1.0; // gives same as the commented out line above
 
     // TODO: Optimize! The compiler will not be able to remove the tangent space that are not use because it can't know due to our UVMapping constant we use for both base and details

Assets/ScriptableRenderPipeline/HDRenderPipeline/ShaderPass/VaryingMesh.hlsl

 #endif
 
 #ifdef VARYINGS_NEED_TANGENT_TO_WORLD
-    float4 tangentWS = float4(input.interpolators2.xyz, input.interpolators2.w > 0.0 ? 1.0 : -1.0);
+    float4 tangentWS = float4(input.interpolators2.xyz, input.interpolators2.w > 0.0 ? 1.0 : -1.0);	// must not be normalized (mikkts requirement)
-    // no normalizes is mandatory for tangentWS
-
-    float3x3 worldToTangent = CreateWorldToTangent(unnormalizedNormalWS, tangentWS.xyz, tangentWS.w);		// this is the mikktspace transformation (must use unnormalized attributes)
+	// this is the mikktspace transformation (must use unnormalized attributes)
+    float3x3 worldToTangent = CreateWorldToTangent(unnormalizedNormalWS, tangentWS.xyz, tangentWS.w);
 
 	// surface gradient based formulation requires a unit length initial normal. We can maintain compliance with mikkts
 	// by uniformly scaling all 3 vectors since normalization of the perturbed normal will cancel it.