update to deprecations page

Author: JPryce-Aklundh

modules/ROOT/pages/deprecations-additions-removals-compatibility.adoc

@@ -12,14 +12,19 @@
 
 Cypher is a language that is constantly evolving.
 New features are added to the language continuously, and occasionally, some features become deprecated and are subsequently removed.
+All changes to Cypher are introduced in Neo4j versions.
 
-This section lists all of the features that have been removed, deprecated, added, or extended in different Cypher versions.
+This section lists all of the features that have been removed, deprecated, added, or extended in different versions of Neo4j.
 Replacement syntax for deprecated and removed features are also indicated.
 
+[IMPORTANT]
+Cypher 25 was introduced in Neo4j 2025.05 and can only be used on 2025.06+ databases.
+Features removed in Cypher 25 are still available on Neo4j 2025.06+ databases either by prepending a query with `CYPHER 5` or by having Cypher 5 as the default language for the database.
+
 [[cypher-deprecations-additions-removals-2025.06]]
 == Neo4j 2025.06
 
-=== Removed features
+=== Removed in Cypher 25
 [cols="2", options="header"]
 |===
 | Feature
@@ -97,7 +102,7 @@ Errors have replaced notifications for impossible link:{neo4j-docs-base-uri}/ope
 |===
 
 
-=== Updated features
+=== Updated in Cypher 25
 
 [cols="2", options="header"]
 |===
@@ -198,7 +203,7 @@ RETURN count(p) AS count
 
 |===
 
-=== New features
+=== New in Cypher 25
 
 [cols="2", options="header"]
 |===