I checked "Supported Encodings" [1] on "Internationalization Guide" for JDK 11.
Currently OpenJDK JDK11 has 173 charsets, but "Supported Encodings" has 172 charsets.
"x-IBM29646C" charset is missing, it's backported by JDK-8220288 [2]
I think "x-IBM29646C" should be added.
"x-IBM29646C" is "IBM-eucJP - Japanese".

Also I found following typos.
1. For "x-MS932_0213"
It should be "x-MS932_0213" instead of "x-MS950-HKSCS"
2. For "x-MS950-HKSCS-XP"
It should be "x-MS950-HKSCS-XP" instead of "x-mswin-936"

[1] https://docs.oracle.com/en/java/javase/11/intl/supported-encodings.html
[2] https://bugs.openjdk.java.net/browse/JDK-8220288