[documentation] WiFi.begin() also accepts bssid, not documented

[atesin]

hi... i was browsing the source... documentation in README.md doesn't mention WiFi.begin()also accept bssid as optional parameter... this differs with WiFiNINA api that doesn't support bssid

https://github.com/JAndrassy/WiFiEspAT/blob/b9443b2142ec07847d17efe4ebbe7a5f1808b1a7/src/WiFi.h#L72

documentation: https://github.com/JAndrassy/WiFiEspAT/blob/master/README.md#enhanced-wifi-api https://github.com/JAndrassy/WiFiEspAT/blob/b9443b2142ec07847d17efe4ebbe7a5f1808b1a7/README.md?plain=1#L193

WiFiNINA api: https://www.arduino.cc/reference/en/libraries/wifinina/wifi.begin/

Syntax
WiFi.begin(ssid);
WiFi.begin(ssid, pass);
WiFi.begin(ssid, keyIndex, key);