ibexa-user-users.raml: Fix typo

Author: adriendupuis

docs/api/rest_api/rest_api_reference/input/ibexa-user-users.raml

@@ -50,7 +50,7 @@ head:
         200:
             description: OK - verifies if there are Users matching the given filter.
         404:
-            description: Error - there are no visibile Users matching the filter.
+            description: Error - there are no visible Users matching the filter.
 /current:
     get:
         displayName: Load current User