Fix obsolete link in Kmail OpenPGP passphrase dialog.

This partially resolves bug report 1179.

certmanager/lib/backends/qgpgme/qgpgmejob.cpp

@@ -290,7 +290,7 @@ char * Kleo::QGpgMEJob::getPassphrase( const char * useridHint, const char * /*d
   }
   msg += "<br/>";
   msg += i18n( "For information on how to set up gpg-agent, see %1" )
-         .arg( "http://kmail.kde.org/kmail-pgpmime-howto.html" );
+         .arg( "http://userbase.kde.org/KMail/PGP_MIME" );
   msg += "<br/><br/>";
   msg += i18n( "Enter passphrase:" );
   Kleo::PassphraseDialog dlg( msg, i18n("Passphrase Dialog") );