Improved docker-compose.yml documentation.

docker-compose.yml

@@ -3,7 +3,7 @@ services:
     # Replace the build section with the next line if instead of building the
     # image from a local checkout you want to pull the latest base
     # (Alpine-based) image from the remote registry
-    # image: "registry.platypush.tech/platypush:latest"
+    # image: "quay.io/platypush/platypush:latest"
 
     build:
       context: .
@@ -51,6 +51,11 @@ services:
       # - /path/to/a/workdir:/var/lib/platypush
       # Optionally, use an external volume for the cache
       # - /path/to/a/cachedir:/var/cache/platypush
+      # This may be required, together with privileged mode, if you want the
+      #   container to access the USB bus on the host (required for example if
+      #   you have USB audio devices that you want to access from your plugins,
+      #   or Bluetooth dongles, or other USB adapters).
+      # - /dev/bus/usb:/dev/bus/usb
 
   redis:
     image: redis