Text about decoupled reflection highlight and refraction direction unclear

[RiverIntheSky]

1. in v1.2, when talking about specular_weight, it is unclear whether transmittance is affected. Fresnel factors contain both Fresnel reflectance and Fresnel transmittance. We should mention explicitly that only reflectance is affected, not the transmittance (which is not energy conserving?) and the refraction direction; or that both reflectance and transmittance are affected, but not the refraction direction.
2. When talking about dispersion, we say "We assume that specular_ior (including any modulation via specular_weight as in equation)", this pontentially contradicts the claim that refraction is unaffected. We need to clarify if/how modulated specular ior affects dispersion.