made it clearer that the {} braces are necessary, replaced an example with a different one that uses the example data set

Author: rsill-neo4j

modules/ROOT/pages/queries/composed-queries/sequential-queries.adoc

@@ -251,7 +251,7 @@ Finally, the fourth query is another conditional query which subsumes multiple b
 
 === Using `NEXT` inside a conditional query using `{}`
 
-In a conditional query that that has a `NEXT` in any of its `THEN` blocks or the `ELSE` block, wrap the part after `THEN` or `ELSE` with `{}`.
+In a conditional query that that has a `NEXT` in any of its `THEN` blocks or the `ELSE` block, it is necessary to wrap the part after `THEN` or `ELSE` with `{}`.
 
 .`NEXT` inside a conditional query
 [source, cypher]
@@ -332,35 +332,43 @@ By using xref:functions/aggregating.adoc#functions-count[`count()`], the list ag
 
 === Using `NEXT` inside a `UNION` using `{}`
 
-In a `UNION` query that that has a `NEXT` in any of its blocks, wrap that block with `{}`.
+In a `UNION` query that that has a `NEXT` in any of its blocks, it is necessary to wrap that block with `{}`.
 
 .`NEXT` inside `UNION`
 [source, cypher]
 ----
 {
-  RETURN 1 AS a
+MATCH (c:Customer)-[:BUYS]->(:Product {name: 'Chocolate'})
+RETURN c AS customer
 
-  NEXT
+NEXT
 
-  RETURN a + 1 AS b
+RETURN customer.firstName AS plantCustomer
 }
+
 UNION ALL
+
 {
-  RETURN 1 AS a
+MATCH (c:Customer)-[:BUYS]->(:Product {name: 'Coffee'})
+RETURN c AS customer
 
-  NEXT
+NEXT
 
-  RETURN a + 1 AS b
+RETURN customer.firstName AS plantCustomer
 }
 ----
 
 .Result
 [role="queryresult",options="header,footer",cols="1*<m"]
 |===
-| b
+| plantCustomer
 
-| 2
-| 2
+| "Amir"
+| "Mateo"
+| "Yusuf"
+| "Mateo"
+| "Hannah"
+| "Niko"
 
-1+d|Rows: 2
+1+d|Rows: 6
 |===