Update fine-tuning phi3-README.md (#4968)(#4969)

Author: ZhaoqiongZ

examples/gpu/llm/fine-tuning/Phi3/README.md

@@ -130,6 +130,7 @@ Example: Phi-3 Mini 4k LoRA fine-tuning.
 
 
 ```bash
+export OCL_ICD_VENDORS=/etc/OpenCL/vendors
 export CCL_PROCESS_LAUNCHER=none
 export TORCH_LLM_ALLREDUCE=1
 
@@ -158,6 +159,7 @@ Example: Phi3-Mini 4k LoRA fine-tuning.
 
 
 ```bash
+export OCL_ICD_VENDORS=/etc/OpenCL/vendors
 export CCL_PROCESS_LAUNCHER=none
 export TORCH_LLM_ALLREDUCE=1
 
@@ -183,3 +185,4 @@ accelerate launch --config_file "fsdp_config.yaml"  phi3_ft.py \
 
 
 
+