Add documentation to a few areas

src/modules/ExternalNotificationModule.cpp

@@ -1,3 +1,17 @@
+/**
+ * @file ExternalNotificationModule.cpp
+ * @brief Implementation of the ExternalNotificationModule class.
+ * 
+ * This file contains the implementation of the ExternalNotificationModule class, which is responsible for handling external notifications such as vibration, buzzer, and LED lights.
+ * The class provides methods to turn on and off the external notification outputs and to play ringtones using PWM buzzer.
+ * It also includes default configurations and a runOnce() method to handle the module's behavior.
+ * 
+ * Documentation:
+ * https://meshtastic.org/docs/settings/moduleconfig/external-notification
+ * 
+ * @author Jm Casler & Meshtastic Team
+ * @date [Insert Date]
+ */
 #include "ExternalNotificationModule.h"
 #include "MeshService.h"
 #include "NodeDB.h"
@@ -113,6 +127,11 @@ int32_t ExternalNotificationModule::runOnce()
     }
 }
 
+/**
+ * Sets the external notification on for the specified index.
+ *
+ * @param index The index of the external notification to turn on.
+ */
 void ExternalNotificationModule::setExternalOn(uint8_t index)
 {
     externalCurrentState[index] = 1;