[SDCT-733] Document broken flaky test handling (#38385)

* Document broken flaky test handling

* Apply suggestion from @TovRudyy

* SDCT-733 Move broken test note into fixed policy row

Author: TovRudyy

content/en/tests/flaky_management/_index.md

@@ -86,7 +86,11 @@ Configure automated Flaky Test Policies to govern how flaky tests are handled in
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          <td>{{< ui >}}Fixed{{< /ui >}}</td>
-         <td>If a flaky test no longer flakes for 30 days, it is automatically moved to the Fixed state. This automation is default behavior and can't be customized.</td>
+         <td>
+           <p>If a flaky test no longer flakes for 30 days, it is automatically moved to the Fixed state. This automation is default behavior and can't be customized.</p>
+           <p>Before Datadog automatically moves a flaky test to {{< ui >}}Fixed{{< /ui >}}, it checks whether the test may be broken rather than fixed. A broken test is a flaky test whose recent executions all failed, resulting in a 100% failure rate over the last 7 days. Datadog does not automatically mark these tests as fixed, which helps prevent quarantined tests that still fail from breaking CI again.</p>
+           <p>Use the {{< ui >}}Broken test{{< /ui >}} facet in the Flaky Tests Management explorer to identify these tests. Filter on <code>broken_test:true</code> to show tests with a 100% failure rate over the last 7 days.</p>
+         </td>
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