Integrated: 8274083: Update testing docs to mention tiered testing

[Aleksey Shipilev]

On Tue, 21 Sep 2021 14:52:26 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 :)

This pull request has now been integrated.

Changeset: 971aa353
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/971aa353aae51222ca33ebfdd61b91672a6c871a
Stats:     60 lines in 2 files changed: 60 ins; 0 del; 0 mod

8274083: Update testing docs to mention tiered testing

Reviewed-by: dholmes, jiefu, stuefe, ihse, mseledtsov, alanb

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