Update docstring in sample_finetune.py

sample_finetune.py

@@ -30,12 +30,12 @@ Here is a sample config for deepspeed zero3:
     compute_environment: LOCAL_MACHINE
     debug: false
     deepspeed_config:
-    gradient_accumulation_steps: 1
-    offload_optimizer_device: none
-    offload_param_device: none
-    zero3_init_flag: true
-    zero3_save_16bit_model: true
-    zero_stage: 3
+      gradient_accumulation_steps: 1
+      offload_optimizer_device: none
+      offload_param_device: none
+      zero3_init_flag: true
+      zero3_save_16bit_model: true
+      zero_stage: 3
     distributed_type: DEEPSPEED
     downcast_bf16: 'no'
     enable_cpu_affinity: false