Update qt_sinks.h

include/spdlog/sinks/qt_sinks.h

@@ -13,8 +13,7 @@
 //    auto logger = spdlog::qt_color_logger_mt("my_logger", my_edit_widget);
 //
 // Warning: those sinks won't be notified if the target widget is destroyed. 
-// If the widget's lifetime can be shorter than the logger's one, you should provide some permanent QObject,
-// and then use a standard signal/slot.
+// Make sure the sink get destryoed, or not used after the widget is gone.
 //
 
 #include "spdlog/common.h"