MINOR: backend: fix comment when killing idle conns

Previously, if a server reached its pool-high-count limit, connection
were killed on connect_server() when reuse was not possible. However,
this is now performed even if reuse is done since the following patch :
  b3397367dc
  MEDIUM: connections: Kill connections even if we are reusing one.

Thus, adjust the related comment to reflect this state.

src/backend.c

@@ -1723,10 +1723,8 @@ int connect_server(struct stream *s)
 	 */
 
 	if (ha_used_fds > global.tune.pool_high_count && srv) {
+		/* We have more FDs than deemed acceptable, attempt to kill an idling connection. */
 		struct connection *tokill_conn = NULL;
-		/* We can't reuse a connection, and e have more FDs than deemd
-		 * acceptable, attempt to kill an idling connection
-		 */
 		/* First, try from our own idle list */
 		HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
 		if (!LIST_ISEMPTY(&srv->per_thr[tid].idle_conn_list)) {