Changing foreground colours for texinfo--mode

[Christopher Dimech]

Currently I have the following code. What I want to do is set the last
two faces in green to be used only in texinfo-mode.

What code should I use for my particular instance?

(custom-set-faces
   '(font-lock-keyword-face ((t (:foreground "#ffdd00"))))
   '(font-lock-type-face ((t (:foreground "#ffdd00"))))
   '(font-lock-variable-name-face ((t (:foreground "green"))))
   '(font-lock-builtin-face ((t (:foreground "green"))))
)