RFR: 8347428: Avoid using secret-key in specifications

[Sean Mullan]

On Tue, 28 Jan 2025 20:08:31 GMT, Ben Perez <bperez at openjdk.org> wrote:

> There are quite some places in API specifications that use the term "secret-key". This is not a formal term. Consider replacing them with "secret key".

Some of the copyright dates need to be updated. Also, I noticed another instance in `src/java.base/share/classes/com/sun/crypto/provider/SunJCE.java`:

`* Secret-key factories in putEntries()`

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PR Comment: https://git.openjdk.org/jdk/pull/23342#issuecomment-2631714447