message: mstarch: minor clarification for GPS tutorial
diff: @@ -882,6 +882,7 @@ fprime-util install
  Now run the ground system in one terminal and the Gps app in the other. Here we inform the ground system that we will
  run the application independently.
  ```shell
  +# In GpsApp directory
  fprime-gds -d . -n
  ```
  @@ -890,7 +891,10 @@ to the USB GPS device. If the device doesn't exist, the system will run but log
  ```shell
  cd fprime/GpsApp
  +# For "Linux":
  ./bin/Linux/GpsApp -a 127.0.0.1 -p 50000 -d /dev/ttyACM0
  +# For "Mac OSX":
  +./bin/Darwin/GpsApp -a 127.0.0.1 -p 50000 -d /dev/ttyACM0
  ```
  If you see output similar to the following, when running with the USB GPS you have successfully, completed the
  