document new unicode deprecation notification for the future 5.15 rel…

…ease

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

@@ -16,6 +16,29 @@ New features are added to the language continuously, and occasionally, some feat
 This section lists all of the features that have been removed, deprecated, added, or extended in different Cypher versions.
 Replacement syntax for deprecated and removed features are also indicated.
 
+
+[[cypher-deprecations-additions-removals-5.15]]
+== Neo4j 5.15
+
+=== Deprecated features
+[cols="2", options="header"]
+|===
+| Feature
+| Details
+
+a|
+label:functionality[]
+label:deprecated[]
+[source, cypher, role="noheader"]
+----
+RETURN 1 as my\u0085identifier
+----
+a|
+The Unicode character \`\u0085` is deprecated for unescaped identifiers and will be considered as a whitespace character in the future. To continue using it, escape the identifier by adding backticks around the identifier.
+This applies to all unescaped identifiers in Cypher, such as label expressions, properties, variable names or parameters. In the given example, the quoted identifier would be \`my…identifier`.
+
+|===
+
 [[cypher-deprecations-additions-removals-5.14]]
 == Version 5.14