message: refactor: add documentation about "private" variable
diff: @@ -11,6 +11,10 @@ export let secretKey = "";
  export let botId = 0n;
  export let applicationId = 0n;
  +/**
  + * Used internally to track the source of truth for event functions
  + * @private
  + */
  export let _eventHandlers: EventHandlers = {};
  export let eventHandlers: EventHandlers = _eventHandlers;
  