Fix typo (#167)

Results in broken asciidoc.

Author: stefano-ottolenghi

modules/ROOT/pages/notifications/index.adoc

@@ -3,7 +3,7 @@
 [[notifications]]
 = Notification codes
 
-Notification codes are Neo4j status codes of type `ClientNotification`and are returned by the server with severity `WARNING` or `INFORMATION`.
+Notification codes are Neo4j status codes of type `ClientNotification` and are returned by the server with severity `WARNING` or `INFORMATION`.
 Contrary to errors, notifications are only returned if the execution of the query is successful.
 
 [[notification-format]]
@@ -78,4 +78,4 @@ The following categories exist, ordered by severity:
 | INFORMATION
 | The query uses costly operations and might be slow. Consider if it is possible to rewrite the query in a different way.
 |
-|===
+|===