[DOCS] Add 8.16.3 release notes (#2329) (#2331)

(cherry picked from commit 1d4ce5b)

Author: jbaiera

docs/src/reference/asciidoc/appendix/release-notes/8.16.3.adoc

@@ -0,0 +1,5 @@
+[[eshadoop-8.16.3]]
+== Elasticsearch for Apache Hadoop version 8.16.3
+
+ES-Hadoop 8.16.3 is a version compatibility release, tested specifically against
+Elasticsearch 8.16.3.

docs/src/reference/asciidoc/appendix/release.adoc

@@ -10,6 +10,7 @@ This section summarizes the changes in each release.
 ===== 8.x
 
 * <<eshadoop-8.17.0>>
+* <<eshadoop-8.16.3>>
 * <<eshadoop-8.16.2>>
 * <<eshadoop-8.16.1>>
 * <<eshadoop-8.16.0>>
@@ -121,6 +122,7 @@ Elasticsearch 5.3.1.
 ////////////////////////
 
 include::release-notes/8.17.0.adoc[]
+include::release-notes/8.16.3.adoc[]
 include::release-notes/8.16.2.adoc[]
 include::release-notes/8.16.1.adoc[]
 include::release-notes/8.16.0.adoc[]