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

[SendaoYan]

Hi all,

Currently, this is no documentation on how to run the application/jcstress tests. I think it will be useful to complement the document test/hotspot/jtreg/applications/jcstress/README on how to run the jcstress tests in jtreg.

No behaviour has been change, only update the ducumentation, no risk.

-------------

Commit messages:
 - remove tmp
 - update
 - 8362501: Update test/hotspot/jtreg/applications/jcstress/README

Changes: https://git.openjdk.org/jdk/pull/26369/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26369&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8362501
  Stats: 10 lines in 1 file changed: 6 ins; 1 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/26369.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26369/head:pull/26369

PR: https://git.openjdk.org/jdk/pull/26369