Docs added

radio/src/lua_api.cpp

@@ -129,7 +129,29 @@ Returns OpenTX version
 
 @retval list (available since OpenTX 2.1.7) returns two values:
  * `string` OpenTX version (ie "2.1.5")
- * `string` radio version (ie "Taranis", "TaranisPlus", if running in simulator the "-simu" is added)
+ * `string` radio version: `taranisx9e`, `taranisplus` or `taranis`. 
+If running in simulator the "-simu" is added
+
+### Example
+
+This example also runs in OpenTX versions where the radio version was not available:
+
+```lua
+local function run(event)
+  local ver, radio = getVersion()
+  print("version: "..ver)
+  if radio then print ("radio: "..radio) end
+  return 1
+end
+
+return {  run=run }
+```
+Output of above script in simulator:
+```
+version: 2.1.7
+radio: taranis-simu
+Script finished with status 1
+```
 */
 static int luaGetVersion(lua_State *L)
 {