Update modules/ROOT/pages/clustering/servers.adoc

Author: NataliaIvakina

modules/ROOT/pages/clustering/servers.adoc

@@ -477,7 +477,7 @@ ALTER SERVER '25a7efc7-d063-44b8-bdee-f23357f89f01' SET OPTIONS {modeConstraint:
 ALTER SERVER '25a7efc7-d063-44b8-bdee-f23357f89f01' SET OPTIONS {allowedDatabases:['foo']};
 ----
 
-The execution of the second `ALTER SERVER` removes the mode constraint `SECONDARY`.
+The execution of the second `ALTER SERVER` removes the mode constraint `SECONDARY`, replacing it with `NONE`.
 
 If you want to keep both values `modeConstraint:'SECONDARY'` and `allowedDatabases:['foo']`, you have to explicitly set them in the options for the `ALTER SERVER` command: