docs: add Changed section for MSTEST0050 severity Error→Warning (`#9670`)

[github-actions]

PR #9670 lowered MSTEST0050 (GlobalTestFixtureShouldBeValidAnalyzer) from Error to Warning to match the six peer fixture analyzers (MSTEST0008–0013). This severity change is already tracked in AnalyzerReleases.Unshipped.md but was not reflected in docs/Changelog.md.

This PR adds a ### Changed section to the 4.3.0 unreleased entry with one bullet documenting the rule-severity downgrade.

Before: [GlobalTestInitialize]/[GlobalTestCleanup] with invalid signature → build error (hard breaks build)
After: Same → build warning (doesn't fail build unless TreatWarningsAsErrors is set)

Found by automated adhoc-qa.

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Show patch (38 lines)

From c87b1e63e28f4623ba0fe0eeb0abba3903b9654c Mon Sep 17 00:00:00 2001
From: "github-actions[bot]" <github-actions[bot]@users.noreply.github.com>
Date: Tue, 7 Jul 2026 07:00:07 +0000
Subject: [PATCH] =?UTF-8?q?docs:=20add=20Changed=20section=20for=20MSTEST0?=
 =?UTF-8?q?050=20severity=20Error=E2=86=92Warning=20in=20Changelog.md?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

MSTEST0050 (GlobalTestFixtureShouldBeValidAnalyzer) was lowered from
Error to Warning in #9670 to match the six peer fixture analyzers
(MSTEST0008–0013). This change is tracked in AnalyzerReleases.Unshipped.md
but was missing from the Changelog.md 4.3.0 section.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 docs/Changelog.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/docs/Changelog.md b/docs/Changelog.md
index b1e020f..df1f028 100644
--- a/docs/Changelog.md
+++ b/docs/Changelog.md
@@ -55,6 +55,10 @@ See full log [of v4.2.3...v4.3.0](https://github.com/microsoft/testfx/compare/v4
 * Fix `[ClassCleanup]` resource leak when `ITestFilter` drops the last test of an initialized class by @Evangelink in [#9503](https://github.com/microsoft/testfx/pull/9503)
 * Fix `CloneWithUpdatedSource` mutating `this` instead of the clone by @Evangelink in [#9581](https://github.com/microsoft/testfx/pull/9581)
 
+### Changed
+
+* Lower `MSTEST0050` (`GlobalTestFixtureShouldBeValidAnalyzer`) severity from `Error` to `Warning`, matching the six peer fixture analyzers (MSTEST0008–0013) by @Evangelink in [#9670](https://github.com/microsoft/testfx/pull/9670)
+
 ## <a name="4.2.3" />[4.2.3] - 2026-05-14
 
 See full log [of v4.2.2...v4.2.3](https://github.com/microsoft/testfx/compare/v4.2.2...v4.2.3)
-- 
2.54.0