Use simpler Plugin::initialize() when feasible

Change-Id: I567965d266f20526bda9f823e31a04b354d53fb1
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/coreplugin/iwizardfactory.cpp

@@ -44,7 +44,7 @@
     To make your wizard known to the system, add your IWizardFactory instance to the
     plugin manager's object pool in your plugin's initialize function:
     \code
-        bool MyPlugin::initialize(const QStringList &arguments, QString *errorString)
+        void MyPlugin::initialize()
         {
             // ... do setup
             addAutoReleasedObject(new MyWizardFactory);