x11-drivers/nvidia-drivers: move nvidia-dbus.conf to docs

As upstream does, believe this should be setup manually if needed and
the rules are questionable. Unlikely many are using powerd yet (many
distros don't ship it too), hardly hear of it working properly. So
skipping a warning and letting it propagate in kernel module rebuilds.

Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

x11-drivers/nvidia-drivers/nvidia-drivers-510.73.05.ebuild

@@ -374,9 +374,7 @@ https://wiki.gentoo.org/wiki/NVIDIA/nvidia-drivers"
 	# MODULE:powerd extras
 	if use amd64; then
 		systemd_dounit systemd/system/nvidia-powerd.service
-
-		insinto /usr/share/dbus-1/system.d
-		doins nvidia-dbus.conf
+		dodoc nvidia-dbus.conf
 	fi
 
 	# symlink non-versioned so nvidia-settings can use it even if misdetected

x11-drivers/nvidia-drivers/nvidia-drivers-515.43.04.ebuild

@@ -397,9 +397,7 @@ https://wiki.gentoo.org/wiki/NVIDIA/nvidia-drivers"
 	# MODULE:powerd extras
 	if use amd64; then
 		systemd_dounit systemd/system/nvidia-powerd.service
-
-		insinto /usr/share/dbus-1/system.d
-		doins nvidia-dbus.conf
+		dodoc nvidia-dbus.conf
 	fi
 
 	# symlink non-versioned profile for nvidia-settings in case