code: public Swagger2MarkupConfigBuilder withListDelimiter(Character delimiter) {
          Validate.notNull(delimiter, "%s must not be null", "delimiter");
          config.listDelimiter = delimiter;
          config.listDelimiterEnabled = true;
          return this;
      }
docs: Specifies the list delimiter which should be used.
  
  @param delimiter the delimiter
  @return this builder