RFR: 8304840: Dangling `CharacterCodingException` in a few javadoc descriptions

Tue Mar 28 18:33:24 UTC 2023

Fixing a documentation bug for `CharacterCodingException` without any description to it as attached. A corresponding CSR is also drafted.

![Screenshot 2023-03-28 at 11 19 00 AM](https://user-images.githubusercontent.com/3122603/228332508-74606c64-bce1-4135-a4cf-b0c76b902676.png)

-------------

Commit messages:
 - Duplicate descriptions in CharacterCodingException
 - 8304840: Dangling `CharacterCodingException` in a few javadoc descriptions

Changes: https://git.openjdk.org/jdk/pull/13214/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13214&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304840
  Stats: 16 lines in 2 files changed: 14 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/13214.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13214/head:pull/13214

PR: https://git.openjdk.org/jdk/pull/13214