customizing some options in cc mode

[Luca]

Hello everyone,

I recently started using emacs for my C++ development and I have a
question about customizing the colours.

I want to customize the code documentation to show up in purple. So
anything in between (// and /**) should show up in the specified
colour.

Does anyone know which emacs variable do I need to set in my .emacs
file for this to work?

Appreciate any help you can give me.

Many thanks,

Luca