[jdk11u-dev] RFR: 8305682: Update the javadoc in the Character class to state support for GB 18030-2022 Implementation Level 2

[Naoto Sato]

This is a backport of GB18030 Level 2 part of the JSR384 MR2 (https://jcp.org/aboutJava/communityprocess/mrel/jsr384/index2.html) Reference Implementation

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Depends on: https://git.openjdk.org/jdk11u-dev/pull/1876

Commit messages:
 - 8305682: Update the javadoc in the Character class to state support for GB 18030-2022 Implementation Level 2

Changes: https://git.openjdk.org/jdk11u-dev/pull/1877/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1877&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305682
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1877.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1877/head:pull/1877

PR: https://git.openjdk.org/jdk11u-dev/pull/1877