Fix terminology

Terminal.Gui/Application.cs

@@ -1409,7 +1409,7 @@ public static partial class Application
     public static event EventHandler<MouseEventEventArgs> MouseEvent;
 
     #nullable enable
-    /// <summary>Called when a mouse event occurs. Fires the <see cref="MouseEvent"/> event.</summary>
+    /// <summary>Called when a mouse event occurs. Raises the <see cref="MouseEvent"/> event.</summary>
     /// <remarks>This method can be used to simulate a mouse event, e.g. in unit tests.</remarks>
     /// <param name="a">The mouse event with coordinates relative to the screen.</param>
     public static void OnMouseEvent (MouseEventEventArgs a)