docs: fix nginx override example

Author: farioas

docker-compose.yml

@@ -19,7 +19,7 @@ services:
       - ./mydata:/label-studio/data:rw
       - ./deploy/nginx/certs:/certs:ro
     #   Optional: Override nginx default conf
-    #      - ./deploy/nginx/default.conf:/label-studio/deploy/nginx/default.conf
+    #      - ./deploy/my.conf:/etc/nginx/nginx.conf
     command: nginx
 
   app: