Update perf_train_gpu_one.md per issue https://github.com/huggingface/hub-docs/issues/1425 max number for bf16 should be 65,504 not 65,535
Update perf_train_gpu_one.md per issue https://github.com/huggingface/hub-docs/issues/1425 max number for bf16 should be 65,504 not 65,535