Add release notes for 8.11.0 (#7984)

Author: flobernd

docs/release-notes/release-notes-8.11.0.asciidoc

@@ -0,0 +1,13 @@
+[[release-notes-8.11.0]]
+== Release notes v8.11.0
+
+[discrete]
+=== Features & Enhancements
+
+- https://github.com/elastic/elasticsearch-net/pull/7978[#7978] Regenerate client for 8.11
+
+[discrete]
+=== Bug fixes
+
+- https://github.com/elastic/elasticsearch-net/pull/7979[#7979] Add workaround for stringified properties which are not marked properly in specification
+- https://github.com/elastic/elasticsearch-net/pull/7965[#7965] Fix `Stringified` converters

docs/release-notes/release-notes.asciidoc

@@ -3,6 +3,11 @@
 
 * <<breaking-changes-policy,Breaking changes policy>>
 
+[discrete]
+== Version 8.11
+
+* <<release-notes-8.11.0,Release notes v8.11.0>>
+
 [discrete]
 == Version 8.10
 
@@ -40,6 +45,7 @@
 * <<release-notes-8.0.0,Release notes v8.0.0>>
 
 include::breaking-change-policy.asciidoc[]
+include::release-notes-8.11.0.asciidoc[]
 include::release-notes-8.10.0.asciidoc[]
 include::release-notes-8.9.3.asciidoc[]
 include::release-notes-8.9.2.asciidoc[]