Api polish

Author: Tyriar

typings/xterm.d.ts

@@ -708,9 +708,9 @@ declare module 'xterm' {
      * @returns an `IDisposable` to stop listening.
      */
     onTitleChange: IEvent<string>;
-    
+
     /**
-     * Adds an event listener for when the bell sound.
+     * Adds an event listener for when the bell is triggered.
      * @returns an `IDisposable` to stop listening.
      */
      onBell: IEvent<void>;