code: public Swagger2MarkupConfigBuilder withInterDocumentCrossReferences(String prefix) {
          Validate.notNull(prefix, "%s must not be null", "prefix");
          config.interDocumentCrossReferencesEnabled = true;
          config.interDocumentCrossReferencesPrefix = prefix;
          return this;
      }
docs: Enable use of inter-document cross-references when needed.
  
  @param prefix Prefix to document in all inter-document cross-references.
  @return this builder