Clarify that the "Average utilization" panel on gpu-fleet reflects the
legacy NVML view (DCGM_FI_DEV_GPU_UTIL) rather than engine-active
profiling. For AI/LLM workloads the NVML number is optimistic; the
gpu-efficiency dashboard carries the profiling-based view.
Signed-off-by: Arsolitt <arsolitt@gmail.com>