FreeBSD Handbook: X …: NVIDIA … update, 535.54.03

https://docs.freebsd.org/en/books/handbook/x11/#x-configuration-nvidia

Update the NVIDIA point of reference for x11/nvidia-driver.

D40168 below was for ports, this is for doc.

https://bugs.freebsd.org/271523

PR: 271523
Differential-revision: https://reviews.freebsd.org/D40168