Update tools/docker/README.md

Applying suggested edit

Co-authored-by: tbradsha <32492176+tbradsha@users.noreply.github.com>

Author: DevinWalker

tools/docker/README.md

@@ -324,7 +324,7 @@ After applying either method, restart your Docker containers:
 
 ```bash
 jetpack docker down
-jetpack docker up
+jetpack docker up -d
 ```
 
 ## Using Ngrok with Jetpack