<i18n dev> RFR: JDK-8315064: j.text.ChoiceFormat provides no specification on quoting behavior

[Justin Lu]

Please review this PR and which adjusts the pattern section of java.text.ChoiceFormat to specify the single quote behavior within a String pattern.

The other Format classes that take a String pattern such as DecimalFormat, CompactNumberFormat, and MessageFormat all provide specification on single quote behavior within a String pattern. ChoiceFormat should have similar specification.

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Commit messages:
 - init

Changes: https://git.openjdk.org/jdk/pull/15994/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15994&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315064
  Stats: 6 lines in 1 file changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15994.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15994/head:pull/15994

PR: https://git.openjdk.org/jdk/pull/15994