docs: private void postProcessClassDocs() {
          for (GroovyClassDoc groovyClassDoc : classDocs.values()) {
              SimpleGroovyClassDoc classDoc = (SimpleGroovyClassDoc) groovyClassDoc;
  
              // potentially add default constructor to class docs (but not interfaces)
              if (classDoc.isClass()) {
                  GroovyConstructorDoc[] constructors = classDoc.constructors();
                  if (constructors != null && constructors.length == 0) { // add default constructor to doc
                      // name of class for the constructor
                      GroovyConstructorDoc constructorDoc = new SimpleGroovyConstructorDoc(classDoc.name(), classDoc);
                      // don't forget to tell the class about this default constructor.
                      classDoc.add(constructorDoc);
                  }
              }
          }
      }