Add Beats breaking changes for 8.4 (#32768)

libbeat/docs/release-notes/breaking/breaking-8.4.asciidoc

@@ -0,0 +1,19 @@
+[[breaking-changes-8.4]]
+
+=== Breaking changes in 8.4
+++++
+<titleabbrev>8.4</titleabbrev>
+++++
+
+See the <<release-notes,release notes>> for a complete list of breaking changes,
+bug fixes, and enhancements, including changes to beta or experimental
+functionality.
+
+//NOTE: The notable-breaking-changes tagged regions are re-used in the
+//Installation and Upgrade Guide
+
+//tag::notable-breaking-changes[]
+
+There are no notable breaking changes in this release.
+
+// end::notable-breaking-changes[]

libbeat/docs/release-notes/breaking/breaking.asciidoc

@@ -11,11 +11,14 @@ changes, but there are breaking changes between major versions (e.g. 7.x to
 
 See the following topics for a description of breaking changes:
 
+* <<breaking-changes-8.4>>
 * <<breaking-changes-8.3>>
 * <<breaking-changes-8.2>>
 * <<breaking-changes-8.1>>
 * <<breaking-changes-8.0>>
 
+include::breaking-8.4.asciidoc[]
+
 include::breaking-8.3.asciidoc[]
 
 include::breaking-8.2.asciidoc[]