Omni: Fix docs

Author: xiangyuT

omni/README.md

@@ -29,7 +29,7 @@ bash build.sh
 Run docker image:
 
 ```bash
-export DOCKER_IMAGE=intel/llm-scaler-omni:0.1.0-b3
+export DOCKER_IMAGE=intel/llm-scaler-omni:0.1.0-b4
 export CONTAINER_NAME=comfyui
 export MODEL_DIR=<your_model_dir>
 export COMFYUI_MODEL_DIR=<your_comfyui_model_dir>