RFR: JDK-8291509 Minor cleanup could be done in sun.security [v3]

[Mark Powers]

On Thu, 1 Sep 2022 02:49:16 GMT, Weijun Wang <weijun at openjdk.org> wrote:

>> Can't argue with that.
>
> Normally we use `SHA2_GROUP`. There are underscores between the words.

Added underscores.

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PR: https://git.openjdk.org/jdk/pull/9972