docs: private static SuggestedFix.Builder addPrivateConstructor(ClassTree classTree) {
      SuggestedFix.Builder fix = SuggestedFix.builder();
      String indent = "  ";
      for (Tree member : classTree.getMembers()) {
        if (member.getKind().equals(METHOD) && !isGeneratedConstructor((MethodTree) member)) {
          fix.prefixWith(
              member,
              indent + "private " + classTree.getSimpleName() + "() {} // no instances\n" + indent);
          break;
        }
        if (!member.getKind().equals(METHOD)) {
          indent = "";
        }
      }
      return fix;
    }