document new unicode deprecation notification for the future 5.15 rel…

…ease

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

@@ -38,6 +38,27 @@ RETURN nullIf(v1, v2)
 | Introduction of a xref::functions/scalar.adoc#functions-nullIf[nullIf()] function.
 This function returns null if the two given parameters are equivalent, otherwise returns the value of the first parameter.
 
+|===
+[[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-5.13]]