RFR: 8339115: Rename TypeKind enum constants to follow code style [v3]

[Adam Sotona]

On Wed, 28 Aug 2024 21:24:34 GMT, Chen Liang <liach at openjdk.org> wrote:

>> `TypeKind` enum constants are named in wrong code style; correct them before finalization.
>> 
>> Also improved `TypeKind` specification to talk about not mentioned `returnType`, `void`, and subword types being erased to int (and how). See the associated CSR too.
>> 
>> See the HTML output for the changed `JSpec` taglet's `6.5.newarray` rendering: https://cr.openjdk.org/~liach/8339115-typekind/java.base/java/lang/classfile/TypeKind.html
>> 
>> Note: when reviewing, please use https://cr.openjdk.org/~iris/se/23/spec/draft/java-se-23-draft-spec-37/ instead of JVMS 22 for reference; JVMS 23 has fixed a few ambiguities about subword types being absent from JVM's stack and locals.
>
> Chen Liang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   space

Looks good to me.

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Marked as reviewed by asotona (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/20737#pullrequestreview-2268803998