Fix the example of shortest path with an unbounded pattern (#193)

[Trello
card](https://trello.com/c/L4hfM5CH/529-the-status-notification-code-example-shows-query-with-error)

Author: renetapopova

modules/ROOT/pages/notifications/all-notifications.adoc

@@ -151,7 +151,9 @@ Query::
 +
 [source, cypher, role="noplay"]
 ----
-MATCH p=shortestPath((n)-[*]->(m)) RETURN p
+MATCH p=shortestPath((n)-[*]->(m))
+WHERE n <> m
+RETURN p
 ----
 
 Description of the returned code::
@@ -164,7 +166,9 @@ Consider adding an upper limit.
 +
 [source, cypher, role="noplay"]
 ----
-MATCH p=shortestPath((n)-[*..8]->(m)) RETURN p
+MATCH p=shortestPath((n)-[*..8]->(m))
+WHERE n <> m
+RETURN p
 ----
 ======
 [.include-with-GQLSTATUS-code]
@@ -174,7 +178,9 @@ Query::
 +
 [source, cypher, role="noplay"]
 ----
-MATCH p=shortestPath((n)-[*]->(m)) RETURN p
+MATCH p=shortestPath((n)-[*]->(m))
+WHERE n <> m
+RETURN p
 ----
 
 Returned GQLSTATUS code::
@@ -192,7 +198,9 @@ Consider adding an upper limit.
 +
 [source, cypher, role="noplay"]
 ----
-MATCH p=shortestPath((n)-[*..8]->(m)) RETURN p
+MATCH p=shortestPath((n)-[*..8]->(m))
+WHERE n <> m
+RETURN p
 ----
 ======
 =====