RFR: 8274083: Update testing docs to mention tiered testing [v2]

[Aleksey Shipilev]

On Thu, 23 Sep 2021 05:44:57 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Aleksey Shipilev has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Revert accidental edit
>>  - More discussion
>
> doc/testing.html line 73:
> 
>> 71: <h3 id="common-test-groups">Common Test Groups</h3>
>> 72: <p>In the ideal world, contributors would be advised to run all the tests for every change. But in real world, one could only be expected to run as many tests as practical, while being mindful of the scope for the change, the testing resources available, etc.</p>
>> 73: <p>The source tree currently defines a few common test groups in the relevant <code>TEST.groups</code> files. The test groups are either covering a specific component, for example <code>hotspot_gc</code>. It is a good idea to look into <code>TEST.groups</code> files to get a sense what tests are relevant to a particular JDK component.</p>
> 
> You state "The test groups are either ..." but there is no "or ..." in that sentence.

Thanks, see new commit.

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