Fix typo (#89)

Co-authored-by: Jonathan Stone <[email protected]>
Co-authored-by: Adrien Herubel <[email protected]>

index.html

@@ -671,7 +671,7 @@
 
 Superimposed on this is the reflection generated by scattering in the subsurface medium. In this case the subsurface medium $V^\infty_\mathrm{subsurface}$ is given a parametrization which is particularly convenient for controlling the volumetric effect of dense subsurface scattering:
 
-   - **`subsurface_scale`** * **`subsurface_radius`**: the desired size of the "blur" on the surface per RGB channel, i.e. roughly the average distance that light travels _along the surface_ per-channel, $\mathbf{r}$, also termed the _diffusion radius_.
+   - **`subsurface_radius`** * **`subsurface_radius_scale`**: the desired size of the "blur" on the surface per RGB channel, i.e. roughly the average distance that light travels _along the surface_ per-channel, $\mathbf{r}$, also termed the _diffusion radius_.
    - **`subsurface_color`**: the observed RGB reflection albedo color taking into account all orders of multiple scattering, $\mathbf{A}$, also termed the _multi-scatter albedo_.
    - **`subsurface_anisotropy`**: the medium's phase function (assumed to be the standard Henyey-Greenstein form), parametrized by the scalar anisotropy $g \in [-1,1]$.