add note re: Docker Desktop terminal usage (coder#725)

Katie Horne · web-flow · commit f32636f253dc · 2021-12-01T14:03:24.000-06:00
diff --git a/setup/docker.md b/setup/docker.md
@@ -15,10 +15,13 @@ You must be using a machine that is running Linux/macOS and has
 
 1. Launch Docker Desktop.
 
-1. If you've previously installed Coder, run `sudo rm -rf ~/.coder` in the terminal.
+1. If you've previously installed Coder, run `sudo rm -rf ~/.coder` in the
+   terminal.
 
 1. In the terminal, run the following to download the resources you need,
-   include the images, and set up your Coder deployment:
+   include the images, and set up your Coder deployment (if you're using the
+   terminal in Docker Desktop, omit the slashes and run as a single-line
+   command):
 
    ```console
    docker run --rm -it \
