add special character to example

Author: timsander1

articles/cosmos-db/sql-query-working-with-json.md

@@ -265,7 +265,7 @@ Here's an example:
 ```sql
     SELECT
            {"JSON expression with a space": { "state": f.address.state, "city": f.address.city }},
-           { "JSON expression with a special character": { "name": f.id }}
+           {"JSON expression with a special character!": { "name": f.id }}
     FROM Families f
     WHERE f.id = "AndersenFamily"
 ```