useless "/"

Author: ikedas

manual/customize/basics-list-config.md

@@ -253,7 +253,7 @@ In general, these files should not be modified manually.
 Deprecated files
 ----------------
 
-  * `/subscribers`
+  * `subscribers`
 
     On Sympa prior to 5.4, this file retained subscriber information.
     Recently, information of subscribers are solely stored in database,