docs(gpu): document counted CDI defaults #2129

Job	Run time
Resolve PR metadata	6s
build-supervisor / Resolve build plan	3s
build-gateway	-1s
build-supervisor / Rust sandbox (amd64) / sandbox (amd64)	3m 22s
build-supervisor / Rust sandbox (arm64) / sandbox (arm64)	3m 27s
build-supervisor / Build supervisor (arm64)	1m 25s
build-supervisor / Build supervisor (amd64)	1m 24s
build-supervisor / Merge supervisor manifest	1m 7s
gpu-e2e / E2E Docker GPU (linux-arm64)	6m 25s
gpu-e2e / E2E Docker GPU (linux-amd64)	3m 55s
gpu-e2e / E2E Docker GPU (wsl-amd64)	6m 44s
kubernetes-e2e	0s
e2e	0s
Kubernetes HA E2E result	0s
kubernetes-ha-e2e	0s
Core E2E result	0s
GPU E2E result	3s
	28m 0s

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