[jdk17u] Integrated: 8274083: Update testing docs to mention tiered testing

[Aleksey Shipilev]

On Mon, 4 Oct 2021 13:16:08 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Clean backport to improve documentation after JDK-8272914 and JDK-8273314 backports.

This pull request has now been integrated.

Changeset: 5e90da94
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.java.net/jdk17u/commit/5e90da94f4af225de1af8c0cd96c800a1924048b
Stats:     60 lines in 2 files changed: 60 ins; 0 del; 0 mod

8274083: Update testing docs to mention tiered testing

Backport-of: 971aa353aae51222ca33ebfdd61b91672a6c871a

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PR: https://git.openjdk.java.net/jdk17u/pull/145