[VPP] minor change (#1665)

Author: zhangcong2019

metro-ai-suite/video-processing-for-nvr/docker/README.md

@@ -22,7 +22,7 @@ To exit the program, you need to open another terminal window and stop the conta
 
 ## Run docker compose 
 1. Run `sudo init 3` switch to non-GUI mode
-2. Run bash ./startup.sh yolov8n_with_preprocess.xml
+2. Run `bash ./startup.sh yolov8n_with_preprocess.xml`
 
 ## Uninstall docker image
 1. Run `docker rmi -f $(docker images --format "{{.Repository}}:{{.Tag}}" | grep 'vppsample')` remove all vppsample docker images