message: fix: use --external on npx cap run android on android.md
diff: @@ -174,7 +174,7 @@ Capacitor uses Android Studio to build and run apps to simulators and devices.
  To start a live-reload server run the following command.
  ```shell
  -ionic capacitor run android -l --host=YOUR_IP_ADDRESS
  +ionic capacitor run android -l --external
  ```
  When running on a device make sure the device and your development machine are connected to the same network.
  