[8.6] 8.6.1 release notes (backport #2911) (#2920)

Co-authored-by: Joe Peeples <joe.peeples@elastic.co>
Co-authored-by: nastasha-solomon <79124755+nastasha-solomon@users.noreply.github.com>
Co-authored-by: nastasha.solomon <nastasha.solomon@elastic.co>

docs/release-notes.asciidoc

@@ -3,7 +3,8 @@
 
 This section summarizes the changes in each release.
 
-* <<release-notes-8.6.0, {elastic-sec} version 8.6.0>> 
+* <<release-notes-8.6.1, {elastic-sec} version 8.6.1>>
+* <<release-notes-8.6.0, {elastic-sec} version 8.6.0>>
 * <<release-notes-8.5.3, {elastic-sec} version 8.5.3>>
 * <<release-notes-8.5.2, {elastic-sec} version 8.5.2>>
 * <<release-notes-8.5.1, {elastic-sec} version 8.5.1>>

docs/release-notes/8.6.asciidoc

@@ -1,6 +1,17 @@
 [[release-notes-header-8.6.0]]
 == 8.6
 
+[discrete]
+[[release-notes-8.6.1]]
+== 8.6.1
+
+[discrete]
+[[bug-fixes-8.6.1]]
+==== Bug fixes and enhancements
+* Fixes a bug that prevented Osquery results from being viewed in {kib} when using the Osquery Manager integration with {agent}. Upgrade to {stack} version 8.6.1 and {agent} 8.6.1 to apply this fix to your deployment (https://github.com/elastic/beats/issues/34250[#34250]). 
+* Fixes a bug that impacted the way Osquery results were displayed in Lens and Discover ({pull}148260[#148260]).
+* Adds an advanced setting to the {elastic-defend} policy that allows users to enable or disable host isolation on Linux endpoints ({pull}149177[#149177]).
+
 [discrete]
 [[release-notes-8.6.0]]
 === 8.6.0