[8.12] Clarify macOS support (#191329) (#191615)

# Backport

This will backport the following commits from `main` to `8.12`:
- [Clarify macOS support
(#191329)](#191329)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT
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BACKPORT-->

Co-authored-by: Pius <pius@elastic.co>

docs/setup/install/targz.asciidoc

@@ -15,6 +15,10 @@ link:/downloads/kibana[Download Kibana] page.
 Other versions can be found on the
 link:/downloads/past-releases[Past Releases page].
 
+[NOTE]
+====
+macOS is supported for development purposes only and is not covered under the support SLA for link:https://www.elastic.co/support/matrix#kibana[production-supported operating systems]. 
+====
 
 [[install-linux64]]
 ==== Download and install the Linux 64-bit package