Replace the reciprocal with the division for readability

Assets/ScriptableRenderLoop/ShaderLibrary/AreaLighting.hlsl

     float d      = length(normal);
     float l1rcpD = l1 * rcp(d);
     float l2rcpD = l2 * rcp(d);
-    float tLDDL1 = l1rcpD * rcp(sq(d) + sq(l1));
-    float tLDDL2 = l2rcpD * rcp(sq(d) + sq(l2));
+    float tLDDL1 = l1rcpD / (sq(d) + sq(l1));
+    float tLDDL2 = l2rcpD / (sq(d) + sq(l2));
     float intWt  = LineFwt(tLDDL2, l2) - LineFwt(tLDDL1, l1);
     float intP0  = LineFpo(tLDDL2, l2rcpD, rcp(d)) - LineFpo(tLDDL1, l1rcpD, rcp(d));
     return intP0 * normal.z + intWt * tangent.z;