code: @Nullable
      static String findDescription(AnnotatedElement annotatedElement) {
          requireNonNull(annotatedElement, "annotatedElement");
          final Optional<Description> description = findFirst(annotatedElement, Description.class);
          if (description.isPresent()) {
              final String value = description.get().value();
              if (DefaultValues.isSpecified(value)) {
                  checkArgument(!value.isEmpty(), "value is empty");
                  return value;
              }
          }
          return null;
      }
docs: Returns the description of the specified {@link AnnotatedElement}.