code: private void definitionRef(MarkupDocBuilder markupDocBuilder, String definitionName) {
          buildDefinitionTitle(markupDocBuilder, crossReference(markupDocBuilder, definitionDocumentResolverDefault.apply(definitionName), definitionName, definitionName), "ref-" + definitionName);
      }
docs: Builds a cross-reference to a separated definition file.
  
  @param definitionName definition name to target