Core: Use Qt5-style connects

The heavy lifting was done by clazy.

Change-Id: I2dde14919d917816d02117338205f8f861d8af0a
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/coreplugin/helpmanager.cpp

@@ -365,7 +365,7 @@ void HelpManager::addUserDefinedFilter(const QString &filter, const QStringList
         emit m_instance->collectionFileChanged();
 }
 
-// -- private slots
+// -- private
 
 void HelpManager::setupHelpManager()
 {
@@ -403,8 +403,6 @@ void HelpManager::setupHelpManager()
     emit m_instance->setupFinished();
 }
 
-// -- private
-
 void HelpManagerPrivate::cleanUpDocumentation()
 {
     // mark documentation for removal for which there is no documentation file anymore