Update configuration.md

docs/admin/configuration.md

@@ -51,7 +51,6 @@ The following table shows the environment variables available for Perseo configu
 | PERSEO_AUTHENTICATION_SERVICE      | Keystone User Service to perform authentication                                                                                                                                                         |
 | PERSEO_CAST_TYPE                   | If true, enable attribute value casting based in NGSI-v2 attribute types if true. If false (default), the JSON native type for the attribute value is used.                                             |
 | PERSEO_MAX_RULES_BY_CORR           | Maximum number of rule executions triggered by the same notification (with the same correlator) until refuse execute a rule. Default is 20. See [loop detection tips](https://github.com/telefonicaid/perseo-fe/blob/master/docs/architecture/architecture.md#loop-detection)
-                                 |
 
 ### Basic Configuration