[jdk21u-dev] RFR: 8331331: :tier1 target explanation in doc/testing.md is incorrect

[SendaoYan]

On Fri, 3 May 2024 16:12:39 GMT, SendaoYan <syan at openjdk.org> wrote:

> Hi,
>   This is clean backport of [JDK-8331331](https://bugs.openjdk.org/browse/JDK-8331331), fixed the incorrect explanation :tier1 target in doc/testing.md. No risk.

> /sponsor

@shipilev Thanks.

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PR Comment: https://git.openjdk.org/jdk21u-dev/pull/551#issuecomment-2095432453