[Observability] 9.3.6 release notes (#6959)

## Summary
This PR closes #6956 and
adds the 9.3.6 Observability release notes.

## Generative AI disclosure

- [x] Yes  
- [ ] No  

Tool(s) and model(s) used: Claude code

Author: mdbirnstiehl

release-notes/elastic-observability/index.md

@@ -236,6 +236,11 @@ There are no user-facing changes in {{observability}} for the 9.4.1 release.
 * Fixes broken breadcrumbs and sidebar navigation for Data Visualizer and AIOps within solution views [#248167]({{kib-pull}}248167).
 * Fixes double scrollbars appearing in fullscreen flyouts [#247744]({{kib-pull}}247744).
 
+## 9.3.6 [elastic-observability-9.3.6-release-notes]
+
+### Fixes [elastic-observability-9.3.6-fixes]
+* Fixes example log messages in the **Logs → Anomalies** page from overlapping and becoming unreadable [#273221]({{kib-pull}}273221).
+* Fixes the **SLO Overview** **No data** tile to correctly count newly created SLOs and SLOs whose summary transform has not yet produced a document [#266315]({{kib-pull}}266315).
 
 ## 9.3.5 [elastic-observability-9.3.5-release-notes]