[JENKINS-72975] Update comment for new known good signatures in tests

src/test/java/org/jenkinsci/plugins/scriptsecurity/sandbox/whitelists/StaticWhitelistTest.java

@@ -147,7 +147,7 @@ static void sanity(URL definition) throws Exception {
             new MethodSignature(Matcher.class, "end", String.class),
             new MethodSignature(Matcher.class, "group", String.class),
             new MethodSignature(Matcher.class, "start", String.class),
-            // Override MatchResult default methods in Java 20+ (for Java 17 compatibility)
+            // Do not exist until Java 20.
             new MethodSignature(MatchResult.class, "end", String.class),
             new MethodSignature(MatchResult.class, "group", String.class),
             new MethodSignature(MatchResult.class, "hasMatch"),