RFR: 8282713: Invalid copyright notice in new test added by JDK-8275715

[David Holmes]

On Mon, 7 Mar 2022 00:46:12 GMT, Masanori Yano <myano at openjdk.org> wrote:

> I would like to fix the missing comma in the copyright of the test added in JDK-8275715.
> Could you please review the fix?

The actual build target is `validate-headers` but I have confirmed the fix. Please integrate asap. Thanks.

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PR: https://git.openjdk.java.net/jdk/pull/7716