RFR: 8274083: Update testing docs to mention tiered testing [v5]

[Alan Bateman]

On Thu, 23 Sep 2021 12:53:23 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Now that OpenJDK has more or less complete `tier{1,2,3,4}` definitions, let's mention them in `testing.md`. 
>> 
>> Current patch is my braindump, I am open for suggestions :)
>
> Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   More fixes

Marked as reviewed by alanb (Reviewer).

doc/testing.html line 80:

> 78: <ul>
> 79: <li><p><code>tier1</code>: This is the lowest test tier. Multiple developers run these tests every day. Because of the widespread use, the tests in <code>tier1</code> are carefully selected and optimized to run fast, and to run in the most stable manner. The test failures in <code>tier1</code> are usually followed up on quickly, either with fixes, or adding relevant tests to problem list. GitHub Actions workflows, if enabled, run <code>tier1</code> tests.</p></li>
> 80: <li><p><code>tier2</code>: This test group covers even more ground. These contain, among other things, tests that either run for too long to be at <code>tier1</code>, or may require special configuration, or tests that are less stable, or cover the broader range of less critical JVM and JDK features/components (for example, jaxp).</p></li>

Thanks for the updates, I think it reads much better now.
A small suggestion is to change "less critical" to "non-core", and "jaxp" to "XML" as I don't expect too many people know what JAXP is.

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PR: https://git.openjdk.java.net/jdk/pull/5615