<i18n dev> RFR: 5061061: SimpleDateFormat: unspecified behavior for reserved pattern letter

[Justin Lu]

Please review this specification update for `SimpleDateFormat` which explicitly specifies the behavior for 'reserved' pattern letters. This is a specification update and has the potential low risk of making an implementation non-compliant. Thus, an associated CSR is filed.

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Commit messages:
 - Make behavior normative
 - init

Changes: https://git.openjdk.org/jdk/pull/24207/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24207&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-5061061
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/24207.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24207/head:pull/24207

PR: https://git.openjdk.org/jdk/pull/24207