Delete @title for 'createdAt' and 'createdBy'. (#73)

Co-authored-by: I560824 <wenjun.zheng@sap.com>
Co-authored-by: Nick Josipovic <nick.josipovic@gmail.com>

index.cds

@@ -40,8 +40,8 @@ entity ChangeLog : managed, cuid {
  serviceEntity : String @title: '{i18n>ChangeLog.serviceEntity}'; // definition name of target entity (on service level) - e.g. ProcessorsService.Incidents
  entity : String @title: '{i18n>ChangeLog.entity}'; // definition name of target entity (on db level) - e.g. sap.capire.incidents.Incidents
  entityKey : UUID @title: '{i18n>ChangeLog.entityKey}'; // primary key of target entity, e.g. Incidents.ID
- createdAt : managed:createdAt @title: 'On';
- createdBy : managed:createdBy @title: 'By';
+ createdAt : managed:createdAt;
+ createdBy : managed:createdBy;
  changes : Composition of many Changes on changes.changeLog = $self;
 }