feat(llmobs): add official release note for LLM Obs (#9436)

This PR adds a release note for the LLM Observability feature, which is
scheduled to be released for general availability in ddtrace 2.9.

## Checklist

- [x] Change(s) are motivated and described in the PR description
- [x] Testing strategy is described if automated tests are not included
in the PR
- [x] Risks are described (performance impact, potential for breakage,
maintainability)
- [x] Change is maintainable (easy to change, telemetry, documentation)
- [x] [Library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html)
are followed or label `changelog/no-changelog` is set
- [x] Documentation is included (in-code, generated user docs, [public
corp docs](https://github.com/DataDog/documentation/))
- [x] Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))
- [x] If this PR changes the public interface, I've notified
`@DataDog/apm-tees`.

## Reviewer Checklist

- [x] Title is accurate
- [x] All changes are related to the pull request's stated goal
- [x] Description motivates each change
- [x] Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes
- [x] Testing strategy adequately addresses listed risks
- [x] Change is maintainable (easy to change, telemetry, documentation)
- [x] Release note makes sense to a user of the library
- [x] Author has acknowledged and discussed the performance implications
of this PR as reported in the benchmarks PR comment
- [x] Backport labels are set in a manner that is consistent with the
[release branch maintenance
policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)

releasenotes/notes/feat-llmobs-8526354f2b311511.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    LLM Observability: This introduces the LLM Observability SDK, which enhances the observability of Python-based LLM applications. 
+    See the `LLM Observability Overview <https://docs.datadoghq.com/tracing/llm_observability/>`_ or the 
+    `SDK documentation <https://docs.datadoghq.com/tracing/llm_observability/sdk>`_ for more information about this feature.