document model picking

run.sh

 #!/bin/bash
 
 PORT=8321
-#MODEL=mistralai/Mistral-7B-Instruct-v0.1
+# list of supported models: https://docs.vllm.ai/en/latest/models/supported_models.html
+MODEL=mistralai/Mistral-7B-Instruct-v0.1
 #MODEL=lmsys/vicuna-13b-v1.3
-MODEL=microsoft/phi-2
+#MODEL=microsoft/phi-2
 HOST=`hostname`
 SEED=1234