Revert "[DOCS] Include docs on permanently unreleased branches only (#51743)" (#52066)

This reverts commit f21b6411a1612135715c0033a59408e41fdb3edb.

docs/Versions.asciidoc

@@ -58,16 +58,6 @@ endif::[]
 :javadoc-license: {rest-high-level-client-javadoc}/org/elasticsearch/protocol/xpack/license
 :javadoc-watcher: {rest-high-level-client-javadoc}/org/elasticsearch/protocol/xpack/watcher
 
-///////
-Permanently unreleased branches (master, n.X)
-///////
-ifeval::["{source_branch}"=="master"]
-:permanently-unreleased-branch:
-endif::[]
-ifeval::["{source_branch}"=="{major-version}"]
-:permanently-unreleased-branch:
-endif::[]
-
 ///////
 Shared attribute values are pulled from elastic/docs
 ///////

docs/reference/index.asciidoc

@@ -40,7 +40,7 @@ include::ingest.asciidoc[]
 
 include::ilm/index.asciidoc[]
 
-ifdef::permanently-unreleased-branch[]
+ifeval::["{release-state}"=="unreleased"]
 
 include::autoscaling/index.asciidoc[]