Remove unused fields from DokumentInfo class.

The `brevkode` and `tittel` fields were removed from the `DokumentInfo` class as they are no longer needed. This helps simplify the code and reduces potential maintenance overhead.

apps/dolly-backend/src/main/java/no/nav/dolly/bestilling/dokarkiv/domain/DokarkivResponse.java

@@ -37,7 +37,5 @@ public List<DokumentInfo> getDokumenter() {
     public static class DokumentInfo {
 
         private String dokumentInfoId;
-        private String brevkode;
-        private String tittel;
     }
 }