Merge pull request #1108 from crazy-max/ls-docs

docs: update ls output example

docs/reference/buildx_ls.md

@@ -16,13 +16,12 @@ Lists all builder instances and the nodes for each instance
 
 ```console
 $ docker buildx ls
-
-NAME/NODE       DRIVER/ENDPOINT             STATUS  PLATFORMS
+NAME/NODE       DRIVER/ENDPOINT             STATUS  BUILDKIT PLATFORMS
 elated_tesla *  docker-container
-  elated_tesla0 unix:///var/run/docker.sock running linux/amd64
-  elated_tesla1 ssh://ubuntu@1.2.3.4        running linux/arm64*, linux/arm/v7, linux/arm/v6
+  elated_tesla0 unix:///var/run/docker.sock running v0.10.3  linux/amd64
+  elated_tesla1 ssh://ubuntu@1.2.3.4        running v0.10.3  linux/arm64*, linux/arm/v7, linux/arm/v6
 default         docker
-  default       default                     running linux/amd64
+  default       default                     running 20.10.14 linux/amd64
 ```
 
 Each builder has one or more nodes associated with it. The current builder's