Add missing doxygen parameter

Re #26025

qt/scientific_interfaces/ISISReflectometry/GUI/MainWindow/MainWindowPresenter.cpp

@@ -18,6 +18,8 @@ namespace CustomInterfaces {
 
 /** Constructor
  * @param view :: [input] The view we are managing
+ * @param messageHandler :: Interface to a class that displays messages to
+ * the user
  * @param batchPresenterFactory :: [input] A factory to create the batches
  * we will manage
  */