docs: drop code references to local plan files

src/BusProNet/ResponseParser.php

@@ -54,7 +54,7 @@ class ResponseParser
                         // to be routed to createCrmAttributesResponse(), which walks a
                         // "selektionsmerkmale" node that is absent here and would have returned an
                         // empty response with every role flag false - dead code until something
-                        // sent the art (.ddev/plans/buspro-crm-selection-write.md).
+                        // sent the art.
                         return $this->createProfileUpdateResponse($xml);
                     case 'Adresse_Neu':
                         return $this->createRegistrationResponse($xml);