doc: updated schematic

main/ate0004.c

@@ -41,7 +41,7 @@ static void _zh_wifi_softap_init(void)
         .ap = {
             .ssid = WIFI_SSID,
             .password = WIFI_PASS,
-            .max_connection = 4,
+            .max_connection = MAX_STA_CONNECTION,
             .authmode = WIFI_AUTH_WPA2_PSK,
         },
     };