Fix remaining examples of CALL subqueries without variable scope clause

modules/ROOT/pages/clauses/union.adoc

@@ -131,10 +131,15 @@ The combined result is returned, without duplicates.
 The `UNION` clause can be used within a xref:subqueries/call-subquery.adoc[`CALL` subquery] to further process the combined results before a final output is returned.
 For example, the below query xref:functions/aggregating.adoc#functions-count[counts] the occurrences of each `name` property returned after the `UNION ALL` within the `CALL` subquery.
 
+[NOTE]
+The below query uses an empty xref:subqueries/call-subquery.adoc#variable-scope-clause[variable scope clause]: `CALL () { ... }` (introduced in Neo4j 5.23).
+If you are using an older version of Neo4j, use `CALL { ... }` instead.
+For more information, see xref:subqueries/call-subquery.adoc#import-variables[CALL subqueries -> Importing variables].
+
 .Query
 [source, cypher]
 ----
-CALL { 
+CALL () { 
   MATCH (a:Actor)
   RETURN a.name AS name
 UNION ALL

modules/ROOT/pages/clauses/use.adoc

@@ -41,13 +41,14 @@ USE <graph>
 +
 [source, syntax, role="noheader"]
 ----
-CALL {
+CALL () {
   USE <graph>
   <other clauses>
 }
 ----
 +
-In subqueries, a `USE` clause may appear as the second clause, if directly following an xref::subqueries/call-subquery.adoc#call-importing-variables[importing `WITH` clause].
+In subqueries, a `USE` clause may appear directly following the xref:subqueries/call-subquery.adoc#variable-scope-clause[variable scope clause]: `CALL () { ... }` (introduced in Neo4j 5.23).
+Or, if you are using an older version of Neo4j, directly following an xref::subqueries/call-subquery.adoc#importing-with[importing `WITH` clause].
 
 When executing queries against a composite database, the `USE` clause must only refer to graphs that are part of the current composite database.
 

modules/ROOT/pages/functions/graph.adoc

@@ -117,7 +117,7 @@ Properties for all graphs on the current composite database are returned.
 UNWIND graph.names() AS name
 WITH name, graph.propertiesByName(name) AS props
 WHERE "A" IN props.tags
-CALL {
+CALL () {
   USE graph.byName(name)
   MATCH (n)
   RETURN n
@@ -127,6 +127,11 @@ RETURN n
 
 Returns all nodes from a subset of graphs that have a `tags` property containing `"A"`.
 
+[NOTE]
+The above query uses an empty xref:subqueries/call-subquery.adoc#variable-scope-clause[variable scope clause]: `CALL () { ... }` (introduced in Neo4j 5.23).
+If you are using an older version of Neo4j, use `CALL { ... }` instead.
+For more information, see xref:subqueries/call-subquery.adoc#import-variables[CALL subqueries -> Importing variables].
+
 ======
 
 [[functions-graph-byname]]
@@ -148,7 +153,7 @@ Returns all nodes from a subset of graphs that have a `tags` property containing
 [source, cypher, indent=0]
 ----
 UNWIND graph.names() AS graphName
-CALL {
+CALL () {
   USE graph.byName(graphName)
   MATCH (n)
   RETURN n
@@ -158,6 +163,11 @@ RETURN n
 
 Returns all nodes from all graphs on the current composite database.
 
+[NOTE]
+The above query uses an empty xref:subqueries/call-subquery.adoc#variable-scope-clause[variable scope clause]: `CALL () { ... }` (introduced in Neo4j 5.23).
+If you are using an older version of Neo4j, use `CALL { ... }` instead.
+For more information, see xref:subqueries/call-subquery.adoc#import-variables[CALL subqueries -> Importing variables].
+
 ======
 
 [role=label--new-5.13]