Missing declaration in WiFiNINA and WiFi library reference example code

hello,

i was looking the wifi reference and found a little error in the [bssid page](https://www.arduino.cc/en/Reference/WiFiBSSID) there is a missing declaration of `status`, not very important but i thought to open it anyway in case it creates any headache to newcomers

Edit: same in the wifinina page: https://www.arduino.cc/en/Reference/WiFiNINABSSID