Improve doxygen

src/main.cpp

@@ -10,10 +10,6 @@
  * Arduino Style but still a .cpp file
  */
 
-/**
- * \file
-
- */
 
 #include "Arduino.h"
 
@@ -21,9 +17,15 @@
 #include "CommandHandler.h"
 #include "DisplayProxyMAX7456.h"
 
-/// The display instance
+/**
+ * @brief Instance of DisplayProxyMAX7456
+ */
 DisplayProxyMAX7456 display;
-//The commandhandler needs a reference to the display instance
+/**
+ * @brief The commandhandler needs a reference to a display instance
+ * 
+ * @return CommandHandler 
+ */
 CommandHandler cmd_handler(&display);
 
 /**