<i18n dev> RFR: 8335271: Specify the MessageFormat ArgumentIndex Implementation Limit

[Justin Lu]

Please review this PR which specifies the _j.text.MessageFormat_ ArgumentIndex limit. A corresponding CSR is drafted.

Both the existence of the limit (and behavior if violated), as well as this implementation's limit are added to the class description. See the JBS issue comments for further history.

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Commit messages:
 - init

Changes: https://git.openjdk.org/jdk/pull/21554/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21554&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8335271
  Stats: 6 lines in 1 file changed: 4 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/21554.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21554/head:pull/21554

PR: https://git.openjdk.org/jdk/pull/21554