This adds tooltip descriptions for five items in the Principled BSDF
that currently have no descriptions at all. Sheen Weight: "Intensity
of the sheen layer, which simulates very small fibers on the surface".
Sheen Roughness: "Roughness of the sheen layer. Low and high roughness
values produce fuzzy or dusty appearance, respectively". Tint Color:
"Color of the sheen reflection". Thin Film Thickness: "Thickness of the
film in nanometers". Thin Film IOR: "Index of refraction (IOR) of the
thin film".
Pull Request: https://projects.blender.org/blender/blender/pulls/126735
c37e6290ec