RFR: 8331331: :tier1 target explanation in doc/testing.md is incorrect [v2]

[SendaoYan]

On Tue, 30 Apr 2024 06:25:46 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Perhaps we should rephrase this so it is not an exhaustive list that has to be updated if the test groupings change. Suggestion:
> 
> ```
> As an example, <code>:tier1</code> will expand to include all subcomponent test directories that define `tier1`, for example:
> <code>jtreg:$(TOPDIR)/test/hotspot/jtreg:tier1 jtreg:$(TOPDIR)/test/jdk:tier1 jtreg:$(TOPDIR)/test/langtools:tier1 ...</code>.
> ```

Thanks for the review and advice. The doc files has been updated by the advice. @erikj79 @dholmes-ora @magicus

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PR Comment: https://git.openjdk.org/jdk/pull/19002#issuecomment-2088574021