setup: limits: 'subflows' for for additional ones

Not the total number, it can be confusing.

Signed-off-by: Matthieu Baerts (NGI0) <[email protected]>

setup.md

@@ -179,8 +179,8 @@ It is also important to make sure the limits are high enough:
 ip mptcp limits set [ subflows NR ] [ add_addr_accepted NR ]
 ```
 
-- `subflows` is the limit of created and accepted subflows (paths), for both the
-  client and server sides (default is 2).
+- `subflows` is the limit of additional created and accepted subflows (paths),
+  for both the client and server sides (default is 2).
 - `add_addr_accepted` is the limit of accepted `ADD_ADDR` -- IP address
   notification from the other peer -- that will result in the creation of
   subflows, typically only for the client side (default is 0).