Replace "Infinite loop" comment in main() with something sensible.

Demo/CORTEX_M4F_STM32F407ZG-SK/main.c

@@ -277,7 +277,11 @@ int main(void)
 	/* Start the scheduler. */
 	vTaskStartScheduler();
 	
-	/* Infinite loop */
+	/* If all is well, the scheduler will now be running, and the following line
+	will never be reached.  If the following line does execute, then there was
+	insufficient FreeRTOS heap memory available for the idle and/or timer tasks
+	to be created.  See the memory management section on the FreeRTOS web site
+	for more details. */
 	for( ;; );	
 }
 /*-----------------------------------------------------------*/