Faces customization group linked from mode groups

[Lennart Borgman]

There was recently a question on the gnu-emacs-help list from someone 
trying to customize the faces used in syntax highlighting C mode. He 
looked in C mode customization group but could not find it.

Maybe it would be a good idea to have a link to the faces customization 
from each mode customization group? (If that is possible in a simple way?)