nvidia comments: Wordsmith

These days, Nvidia graphics is more platforms than just cards, more
renderers than just OpenGL, and more display protocols than just X.
It's also written in uppercase. This increases consistency, clarity,
and eliminates jarring line wrapping at reference column width 80.

PR: 293473 (graphics/nvidia-texture-tools)
PR: 293474 (sysutils/nvclock)
PR: 293475 (sysutils/py-nvitop)
Reviewed by: amdmi3, ashafer, danfe, kbowling
Reviewed by: Tomoaki Aoki <junchoon_dec.sakura.ne.jp>
Differential Revision: https://reviews.freebsd.org/D55452