Update cli_commands.md to include 'ver'

Include the 'ver' command for retrieving the firmware version

docs/cli_commands.md

@@ -405,6 +405,11 @@ This document provides an overview of CLI commands that can be sent to MeshCore
 
 ---
 
+#### View this node's firmware version
+**Usage:** `ver`
+
+---
+
 #### View this node's configured role
 **Usage:** `get role`