feat: delete useless comment.

src/Ursa/Controls/DateTimePicker/DateRangePicker.cs

@@ -467,12 +467,6 @@ public class DateRangePicker : DatePickerBase, IClearControl
     private bool _isFocused;
     private void FocusChanged(bool hasFocus)
     {
-        // The OnGotFocus & OnLostFocus are asynchronously and cannot
-        // reliably tell you that have the focus.  All they do is let you
-        // know that the focus changed sometime in the past.  To determine
-        // if you currently have the focus you need to do consult the
-        // FocusManager.
-
         bool wasFocused = _isFocused;
         _isFocused = hasFocus;