docs(gpu-operator): document tolerate-all on compat DaemonSet

Explain why tolerations: [{operator: Exists}] is safe on the driver
compat DaemonSet: the nodeSelector already confines scheduling to GPU
nodes, so the blanket toleration only kicks in when those nodes carry
the dedicated=gpu / nvidia.com/gpu taints that the GPU Operator's
default policy and many deployments apply.

Signed-off-by: Arsolitt <arsolitt@gmail.com>

packages/system/gpu-operator/examples/nvidia-driver-compat.yaml

@@ -35,6 +35,13 @@ spec:
       # cluster uses to mark GPU hosts.
       nodeSelector:
         nvidia.com/gpu.present: "true"
+      # Tolerate-all is intentionally broad: the nodeSelector above already
+      # confines scheduling to GPU nodes, so the "Exists" toleration only
+      # matters when those nodes carry extra taints (dedicated=gpu:NoSchedule,
+      # nvidia.com/gpu:NoSchedule from the GPU Operator's default policy,
+      # etc.). This mirrors the stance of the upstream nvidia-driver-daemonset
+      # and nvidia-device-plugin DaemonSets — blanket tolerations plus a
+      # narrow nodeSelector.
       tolerations:
         - operator: Exists
       initContainers: