Add Fleet/Agent 8.5.1 release notes (#2361) (#2363)

* Add Fleet/Agent 8.5.1 release notes

* Add changes from the review

* Update docs/en/ingest-management/release-notes/release-notes-8.5.asciidoc

(cherry picked from commit d0c53cb)

Co-authored-by: DeDe Morton <[email protected]>

docs/en/ingest-management/release-notes/release-notes-8.5.asciidoc

@@ -3,6 +3,7 @@
 :kibana-pull: https://github.com/elastic/kibana/pull/
 :agent-issue: https://github.com/elastic/elastic-agent/issues/
 :beats-issue: https://github.com/elastic/beats/issues/
+:beats-pull: https://github.com/elastic/beats/pull/
 :agent-libs-pull: https://github.com/elastic/elastic-agent-libs/pull/
 :agent-pull: https://github.com/elastic/elastic-agent/pull/
 :fleet-server-issue: https://github.com/elastic/fleet-server/issues/
@@ -13,13 +14,45 @@
 
 This section summarizes the changes in each release.
 
+* <<release-notes-8.5.1>>
 * <<release-notes-8.5.0>>
 
 Also see:
 
 * {kibana-ref}/release-notes.html[{kib} release notes]
 * {beats-ref}/release-notes.html[{beats} release notes]
 
+// begin 8.5.1 relnotes
+
+[[release-notes-8.5.1]]
+== {fleet} and {agent} 8.5.1
+
+Review important information about the {fleet} and {agent} 8.5.1 release.
+
+[discrete]
+[[enhancements-8.5.1]]
+=== Enhancements
+
+{agent}::
+* Improve shutdown logs {agent-pull}1618[#1618]
+
+[discrete]
+[[bug-fixes-8.5.1]]
+=== Bug fixes
+
+{fleet}::
+* Make asset tags space aware {kibana-pull}144066[#144066]
+
+{fleet-server}::
+* No bug fixes for this release
+
+{agent}::
+* Fix: Windows Agent left unhealthy after removing Endpoint integration {agent-pull}1286[#1286]
+* Fix how multiple {fleet-server} hosts are handled {agent-pull}1329[#1329]
+* Beats will now attempt to recover if a lock file has not been removed {beats-pull}33169[#33169]
+
+// end 8.5.1 relnotes
+
 // begin 8.5.0 relnotes
 
 [[release-notes-8.5.0]]