whenov [1] filed a request to merge nvidia-docker [2] into nvidia- docker2 [3]:

Since the package `nvidia-docker` has been updated to version 2, it's meaningless to have both `nvidia-docker` and `nvidia-docker2`.

[1] https://aur.archlinux.org/account/whenov/ [2] https://aur.archlinux.org/pkgbase/nvidia-docker/ [3] https://aur.archlinux.org/pkgbase/nvidia-docker2/