code: public Swagger2MarkupConfigBuilder withAnchorPrefix(String anchorPrefix) {
          Validate.notNull(anchorPrefix, "%s must not be null", "anchorPrefix");
          config.anchorPrefix = anchorPrefix;
          return this;
      }
docs: Optionally prefix all anchors for uniqueness.
  
  @param anchorPrefix anchor prefix.
  @return this builder