8362501: Update test/hotspot/jtreg/applications/jcstress/README

Backport-of: 559795b0eb8061325127fa9fdf8b80617fe47166

Author: SendaoYan

test/hotspot/jtreg/applications/jcstress/README

@@ -1,4 +1,4 @@
-Copyright (c) 2017, 2022, Oracle and/or its affiliates. All rights reserved.
+Copyright (c) 2017, 2025, Oracle and/or its affiliates. All rights reserved.
 DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 
 This code is free software; you can redistribute it and/or modify it
@@ -24,10 +24,13 @@ The tests located under this directory run tests from the Java Concurrency
 Stress test suite[1] (a.k.a. jcstress). This suite aims to verify the
 correctness of concurrency support in the JDK.
 
-All the tests are run through the test driver class -- JcstressRunner, which
-downloads the specified build of org.openjdk.jcstress:jcstress-tests-all,
+All the tests are run through the test driver class -- JcstressRunner, 
 spawns a new JVM to run one jcstress test and checks that it finishes
-successfully.
+successfully. These tests require a build of org.openjdk.jcstress:jcstress-tests-all.
+If this artifact could not be found automatically, you can build it using jcstress
+guide[1], and then pass the JAR location with JDK option such as
+-Djdk.test.lib.artifacts.jcstress-tests-all=jcstress-tests-all.jar,
+either with explicit -javaoption: or TEST_VM_OPTS test variable.
 
 When the used version of org.openjdk.jcstress:jcstress-tests-all needs to be
 changed, one should make corresponding changes to the artifact description in