Update portals-qt.rst

Replace deprecated KRun with OpenUrlJob

docs/portals-qt.rst

@@ -5,7 +5,7 @@ Qt and KDE libraries will transparently use portals for some functionality when
 they detect that they are being used inside a Flatpak sandbox. Here are some
 hints for what Qt or KDE applications should do to benefit from this.
 
-- Use ``QDesktopServices::openUrl(const QUrl &url)`` or ``KIO::KRun`` to
+- Use ``QDesktopServices::openUrl(const QUrl &url)`` or ``KIO::OpenUrlJob`` to
   open URIs or send an email when using ``mailto`` URL
 - Use ``QFileDialog`` class to open files and, as of Qt ``5.18.90``, directories. Avoid using
   ``QFileDialog::DontUseNativeDialog``. Note that portals cannot currently