[jdk25u] RFR: 8367237: Thread-Safety Usage Warning for java.text.Collator Classes

[Kieran Farrell]

Clean backport

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Commit messages:
 - update spec

Changes: https://git.openjdk.org/jdk25u/pull/314/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=314&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367237
  Stats: 17 lines in 2 files changed: 10 ins; 4 del; 3 mod
  Patch: https://git.openjdk.org/jdk25u/pull/314.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/314/head:pull/314

PR: https://git.openjdk.org/jdk25u/pull/314