RFR: 7903459: Update changelog for jtreg 7.2

Thu Apr 20 16:03:13 UTC 2023

On Thu, 20 Apr 2023 07:18:54 GMT, Christian Stein <cstein at openjdk.org> wrote:

> Please review this commit that updates the changelog file to include a section for jtreg 7.2.
> 
> It also adds the entry to the list of noteworthy unreleased changes of the upcoming jtreg 7.3 release.

Marked as reviewed by jjg (Lead).

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PR Review: https://git.openjdk.org/jtreg/pull/150#pullrequestreview-1394321946