Update creator plugin template

Amends 227bc8b6a4.

Change-Id: Iedbcd97e177fd8309e889fd6ad309644f65f0a93
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

share/qtcreator/templates/wizards/qtcreatorplugin/myplugin.cpp

@@ -45,7 +45,7 @@ public:
         // depends on have passed their initialize() phase.
 
         // If you need access to command line arguments or to report errors, use the
-        //    bool IPlugin::initialize(const QStringList &arguments, QString *errorString)
+        //    Utils::Result<> IPlugin::initialize(const QStringList &arguments)
         // overload.
 
         ActionContainer *menu = ActionManager::createMenu(Constants::MENU_ID);