etc: Remove comments about nogroups and noroot on nvidia

`nogroups` should not have been causing issues with rendering on nvidia
since commit 623e68216 ("temporary fix for nvidia/nogroups/noroot issue
(#3644, #841)", 2020-10-02) and commit cb460c32c ("more nvidia (#3644)",
2020-10-03), which had made it a no-op on nvidia.  And the handling of
the "render" and "video" groups are independent to the handling of
`nogroups` now; see the previous 3 commits.

Commits which introduced the comments on each profile:

* kodi.profile: commit ce462b6b1 ("fix #3501", 2020-07-16)
* mpsyt.profile: commit e17b48fca ("new profile mpsyt.profile",
  2018-11-28)
* mpv.profile: commit cc7c48983 ("Document #1945", 2018-07-25)
* steam.profile: commit d6f8169dd ("steam fixes; #841, #3267",
  2020-03-15)

Commands used to find the comments:

    git grep -i nvidia -- etc/profile-* | grep -v private-etc

Relates to #4632.

1 files changed, 0 insertions, 1 deletions

diff --git a/etc/profile-m-z/steam.profile b/etc/profile-m-z/steam.profile
index dfefd7c2c..bcf94de51 100644
--- a/etc/profile-m-z/steam.profile
+++ b/etc/profile-m-z/steam.profile
@@ -132,7 +132,6 @@ netfilter
 nodvd
 nogroups
 nonewprivs
-# If you use nVidia you might need to add 'ignore noroot' to your steam.local.
 noroot
 notv
 nou2f