<i18n dev> RFR: 8299500: Usage of constructors of primitive wrapper classes should be avoided in java.text API docs

[Justin Lu]

Removed constructors of primitive wrapper classes (deprecated for removal) for the following
- _java.text.ChoiceFormat_
- _java.text.MessageFormat_ 

Replaced with .valueOf() method

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Commit messages:
 - Fix ChoiceFormat
 - Fix MessageFormat

Changes: https://git.openjdk.org/jdk/pull/11884/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11884&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299500
  Stats: 7 lines in 2 files changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/11884.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11884/head:pull/11884

PR: https://git.openjdk.org/jdk/pull/11884