Remove references to KServiceTypeTrader in comments

src/kitemviews/kfileitemlistview.h

@@ -48,7 +48,7 @@ public:
      * Per default all plugins enabled in the KConfigGroup "PreviewSettings"
      * are used.
      *
-     * For a list of available plugins, call KServiceTypeTrader::self()->query("ThumbCreator").
+     * For a list of available plugins, call KIO::PreviewJob::availableThumbnailerPlugins().
      *
      * @see enabledPlugins
      */

src/kitemviews/kfileitemmodelrolesupdater.h

@@ -131,7 +131,7 @@ public:
      * Per default all plugins enabled in the KConfigGroup "PreviewSettings"
      * are used.
      *
-     * For a list of available plugins, call KServiceTypeTrader::self()->query("ThumbCreator").
+     * For a list of available plugins, call KIO::PreviewJob::availableThumbnailerPlugins().
      *
      * @see enabledPlugins
      */

src/views/versioncontrol/versioncontrolobserver.cpp

@@ -275,8 +275,8 @@ int VersionControlObserver::createItemStatesList(QMap<QString, QVector<ItemState
 void VersionControlObserver::initPlugins()
 {
     if (!m_pluginsInitialized) {
-        // No searching for plugins has been done yet. Query the KServiceTypeTrader for
-        // all fileview version control plugins and remember them in 'plugins'.
+        // No searching for plugins has been done yet. Query all fileview version control
+        // plugins and remember them in 'plugins'.
         const QStringList enabledPlugins = VersionControlSettings::enabledPlugins();
 
         const QVector<KPluginMetaData> plugins = KPluginMetaData::findPlugins(QStringLiteral("dolphin/vcs"));