Fix typos and spelling

src/engine/gstengine.cpp

@@ -678,7 +678,7 @@ QByteArray GstEngine::FixupUrl(const QUrl &url) {
     }
     else {
       // Currently, Gstreamer can't handle input CD devices inside cdda URL.
-      // So we handle them ourselve: we extract the track number and re-create an URL with only cdda:// + the track number (which can be handled by Gstreamer).
+      // So we handle them ourselves: we extract the track number and re-create an URL with only cdda:// + the track number (which can be handled by Gstreamer).
       // We keep the device in mind, and we will set it later using SourceSetupCallback
       QStringList path = url.path().split('/');
       str = QString("cdda://%1").arg(path.takeLast());

src/engine/gstenginepipeline.cpp

@@ -888,7 +888,7 @@ void GstEnginePipeline::SourceSetupCallback(GstPlayBin *bin, GParamSpec *pspec,
   }
 
   if (g_object_class_find_property(G_OBJECT_GET_CLASS(element), "device") && !instance->source_device().isEmpty()) {
-    // Gstreamer is not able to handle device in URL (refering to Gstreamer documentation, this might be added in the future).
+    // Gstreamer is not able to handle device in URL (referring to Gstreamer documentation, this might be added in the future).
     // Despite that, for now we include device inside URL: we decompose it during Init and set device here, when this callback is called.
     g_object_set(element, "device", instance->source_device().toLocal8Bit().constData(), nullptr);
   }