JavaDoc warnings in Java 21

[javadev]

[INFO] --- maven-javadoc-plugin:3.5.0:jar (attach-javadocs) @ json ---
[INFO] No previous run data found, generating javadoc.
Warning:  Javadoc Warnings
Warning:  /home/runner/work/JSON-java/JSON-java/src/main/java/org/json/CDL.java:26: warning: use of default constructor, which does not provide a comment
Warning:  public class CDL {
Warning:  ^
Warning:  /home/runner/work/JSON-java/JSON-java/src/main/java/org/json/Cookie.java:16: warning: use of default constructor, which does not provide a comment
Warning:  public class Cookie {
Warning:  ^
Warning:  /home/runner/work/JSON-java/JSON-java/src/main/java/org/json/CookieList.java:12: warning: use of default constructor, which does not provide a comment
Warning:  public class CookieList {
Warning:  ^
Warning:  /home/runner/work/JSON-java/JSON-java/src/main/java/org/json/HTTP.java:14: warning: use of default constructor, which does not provide a comment
Warning:  public class HTTP {
Warning:  ^
Warning:  /home/runner/work/JSON-java/JSON-java/src/main/java/org/json/JSONML.java:15: warning: use of default constructor, which does not provide a comment
Warning:  public class JSONML {
Warning:  ^
Warning:  /home/runner/work/JSON-java/JSON-java/src/main/java/org/json/JSONPointer.java:43: warning: use of default constructor, which does not provide a comment
Warning:  public static class Builder {
Warning:  ^
Warning:  /home/runner/work/JSON-java/JSON-java/src/main/java/org/json/JSONPropertyName.java:24: warning: no main description
Warning:  * @return The name of the property as to be used in the JSON Object.
Warning:  ^
Warning:  /home/runner/work/JSON-java/JSON-java/src/main/java/org/json/Property.java:15: warning: use of default constructor, which does not provide a comment
Warning:  public class Property {
Warning:  ^
Warning:  /home/runner/work/JSON-java/JSON-java/src/main/java/org/json/XML.java:25: warning: use of default constructor, which does not provide a comment
Warning:  public class XML {
Warning:  ^
Warning: [WARNING] 9 warnings

[stleary]

@javadev Sorry for not posting sooner. No objections if you want to fix these warnings.

[javadev]

A pull request has been initiated

#860