Doc: Add placeholder for 8.3 release notes (#14180) (#14237)

(cherry picked from commit d1f52ea)
Co-authored-by: Karen Metts <[email protected]>

Author: github-actions[bot]

docs/static/releasenotes.asciidoc

@@ -3,6 +3,7 @@
 
 This section summarizes the changes in the following releases:
 
+* <<logstash-8-3-0,Logstash 8.3.0>>
 * <<logstash-8-2-2,Logstash 8.2.2>>
 * <<logstash-8-2-1,Logstash 8.2.1>>
 * <<logstash-8-2-0,Logstash 8.2.0>>
@@ -18,6 +19,26 @@ This section summarizes the changes in the following releases:
 * <<logstash-8-0-0-alpha2,Logstash 8.0.0-alpha2>>
 * <<logstash-8-0-0-alpha1,Logstash 8.0.0-alpha1>>
 
+
+[[logstash-8-3-0]]
+=== Logstash 8.3.0 Release Notes
+
+coming[8.3.0]
+
+[[features-8.3.0]]
+==== New features and enhancements
+
+
+[[notable-8.3.0]]
+==== Performance improvements and notable issues fixed
+
+
+[[plugins-8.3.0]]
+==== Plugin releases
+
+
+
+
 [[logstash-8-2-2]]
 === Logstash 8.2.2 Release Notes