ogma-cli: Replace ROS2 with ROS 2 in the CLI help. Refs #83.

The Open Source Robotics Foundation, Inc. (OSRF) has published specific
guidance on how the ROS 2 should be referred to, and they have indicated that
they would want it to be called ROS 2 instead of ROS2.

This commit replaces ROS2 with ROS 2 in the command-line help.

ogma-cli/src/CLI/CommandROSApp.hs

@@ -81,7 +81,7 @@ command c =
 
 -- | ROS command description
 commandDesc :: String
-commandDesc = "Generate a ROS2 monitoring package"
+commandDesc = "Generate a ROS 2 monitoring package"
 
 -- | Subparser for the @ros@ command, used to generate a Robot Operating System
 -- application connected to Copilot monitors.