Fix a minor PHP CS Fixer warning in SendSEPADirectDebit.php

It's the last remaining warning across the code base.

Author: Philipp91

lib/Fhp/Action/SendSEPADirectDebit.php

@@ -11,8 +11,10 @@
 use Fhp\Segment\Common\Kti;
 use Fhp\Segment\DME\HIDMESv1;
 use Fhp\Segment\DME\HIDMESv2;
+use Fhp\Segment\DME\HKDMEv2;
 use Fhp\Segment\DSE\HIDSESv2;
 use Fhp\Segment\DSE\HIDXES;
+use Fhp\Segment\DSE\HKDSEv2;
 use Fhp\Segment\SPA\HISPAS;
 use Fhp\Syntax\Bin;
 use Fhp\UnsupportedException;
@@ -159,7 +161,7 @@ protected function createRequest(BPD $bpd, ?UPD $upd)
                 . implode(', ', $supportedPainNamespaces));
         }
 
-        /** @var mixed $hkdxe */ // TODO Put a new interface type here.
+        /** @var HKDMEv2|HKDSEv2|HIDXES $hkdxe */
         $hkdxe = $hidxes->createRequestSegment();
         $hkdxe->kontoverbindungInternational = Kti::fromAccount($this->account);
         $hkdxe->sepaDescriptor = $this->painNamespace;