Update ART chroot-based testing instructions w.r.t. JDWP tests.

Update `test/README.chroot.md` to mention
`art/tools/run-libjdwp-tests.sh` instead of using
`art/tools/run-jdwp-tests.sh` directly. The old JDWP implementation
was retired in
https://android-review.googlesource.com/c/platform/art/+/1216803/.

Test: Run JDWP tests in ART chroot environment.
Bug: 34729697
Bug: 119034743
Change-Id: Ib83f241bb4866948074224184a63952e4b7766f7
diff --git a/test/README.chroot.md b/test/README.chroot.md
index 7c3fa8f..a4fee55 100644
--- a/test/README.chroot.md
+++ b/test/README.chroot.md
@@ -114,11 +114,11 @@
 10. Run JDWP tests:
     * On a 64-bit target:
         ```bash
-        art/tools/run-jdwp-tests.sh --mode=device --variant=X64
+        art/tools/run-libjdwp-tests.sh --mode=device --variant=X64
         ```
     * On a 32-bit target:
         ```bash
-        art/tools/run-jdwp-tests.sh --mode=device --variant=X32
+        art/tools/run-libjdwp-tests.sh --mode=device --variant=X32
         ```
 11. Tear down device setup:
     ```bash