Changed port forwarding instructions to specify port range

gt-workbench.md

@@ -62,14 +62,14 @@ it does not have to be like this, as you can have many containers based on the
 same image.
 
 ```bash
-docker create --platform linux/amd64 -p 3000:3000 -i -t -v .:/work --name gt-workbench gt-workbench
+docker create --platform linux/amd64 -p 3000-5000:3000-5000 -i -t -v .:/work --name gt-workbench gt-workbench
 ```
 
 :::{warning} Port forwarding with Docker
 Port forwarding is required so that myst running inside docker can be accessed from your browser.
-The port can be specified via
+The range of ports can be specified via
 ```bash
--p HOSTPORT:CONTAINERPORT
+-p HOSTPORT(START)-(END):CONTAINERPORT(START)-(END)
 ```
 :::