suggestion from Orion

Author: eliottrosenberg

docs/tutorials/gcp_gpu.md

@@ -203,9 +203,10 @@ q0, q1 = cirq.LineQubit.range(2)
 circuit = cirq.Circuit(cirq.H(q0), cirq.CX(q0, q1))
 
 # Instantiate a simulator that uses the GPU
-# xx = 0 for Option 1, 1 for Option 2, or the number of GPUs for Option 3.
-# Important: If you are using cuQuantum Appliance (option 3), change `use_gpu=True` to `disable_gpu=False`.
-gpu_options = qsimcirq.QSimOptions(use_gpu=True, gpu_mode = xx, max_fused_gate_size=4)
+# Option 1 (mode=0) or Option 2 (mode=1)
+gpu_options = qsimcirq.QSimOptions(use_gpu=True, gpu_mode = mode, max_fused_gate_size=4)
+# Option 3 (number of GPUs = `num_gpus`)
+gpu_options = qsimcirq.QSimOptions(disable_gpu=False, gpu_mode = num_gpus, max_fused_gate_size=4)
 qsim_simulator = qsimcirq.QSimSimulator(qsim_options=gpu_options)
 
 # Run the simulation