Typo in Scan Class Documentation

https://arduino-esp8266.readthedocs.io/en/latest/esp8266wifi/scan-class.html#scannetworks 

I believe it is supposed to be `async` not `asysnc`

<img width="859" height="509" alt="Image" src="https://github.com/user-attachments/assets/89bc521b-074b-4efc-ae69-a712057cbe0b" />