[8.12] [DOCS] Add security update to 8.11.2 (#173162) (#173216)

# Backport

This will backport the following commits from `main` to `8.12`:
- [[DOCS] Add security update to 8.11.2
(#173162)](#173162)

<!--- Backport version: 8.9.7 -->

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

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Add security update to 8.11.2
(#173162)","sha":"fce1bd989b52c6a03962ffe4460c91dfaa8d3fd7","branchLabelMapping":{"^v8.13.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["Team:Docs","release_note:skip","v8.12.1","v8.13.0","v8.11.3"],"number":173162,"url":"https://github.com/elastic/kibana/pull/173162","mergeCommit":{"message":"[DOCS]
Add security update to 8.11.2
(#173162)","sha":"fce1bd989b52c6a03962ffe4460c91dfaa8d3fd7"}},"sourceBranch":"main","suggestedTargetBranches":["8.12","8.11"],"targetPullRequestStates":[{"branch":"8.12","label":"v8.12.1","labelRegex":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"main","label":"v8.13.0","labelRegex":"^v8.13.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/173162","number":173162,"mergeCommit":{"message":"[DOCS]
Add security update to 8.11.2
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Co-authored-by: Abdon Pijpelink <[email protected]>

docs/CHANGELOG.asciidoc

@@ -80,6 +80,12 @@ Operations::
 
 The 8.11.2 release includes the following bug fixes.
 
+[float]
+[[security-update-v8.11.2]]
+=== Security updates
+
+* The 8.11.2 patch release contains a fix for a potential security vulnerability. https://discuss.elastic.co/c/announcements/security-announcements/31[Please see our security advisory for more details].
+
 [float]
 [[enhancement-v8.11.2]]
 === Enhancements