code: public ApiParser modify(final Predicate<RouteMethod> matcher,
        final Consumer<RouteMethod> customizer) {
      this.customizer.put(matcher, customizer);
      return this;
    }
docs: Modify one or more route method who matches the filter. Work as a API to fix possible missing
  metadata.
  
  @param matcher Route matcher.
  @param customizer Customizer.
  @return This parser.