Fix memcached.ini comment - use new config name not the old one (#455)

Author: jboulen

memcached.ini

@@ -60,7 +60,7 @@
 
 ; Write data to a number of additional memcached servers
 ; This is "poor man's HA" as libmemcached calls it.
-; If this value is positive and sess_remove_failed is enabled
+; If this value is positive and sess_remove_failed_servers is enabled
 ; when a memcached server fails the session will continue to be available
 ; from a replica. However, if the failed memcache server
 ; becomes available again it will read the session from there