message: docs(deepkit-type): fix ObjectId type
diff: @@ -127,8 +127,10 @@ Example:
  ```ts
  import { t, jsonSerializer } from '@deepkit/type';
  -import { ObjectId } from 'bson'; // or from mongodb or mongoose
  +import * as mongoose from 'mongoose';
  +// Shorten type
  +const ObjectId = mongoose.Types.ObjectId;
  // Create a Custom Serializer to add custom transfrom functions to types
  const mySerializer = new (class CustomSerializer extends jsonSerializer.fork('mySerializer') {})();
  