* Update `WiFiScan` example to show more useful data

* Add channel to output.
* Add type of encryption to output.
* Format output as table.
* Update outdated example description.
* Add `scanDelete()` as hint to free memory.

* added 32 chars SSID + readme edit
Co-authored-by: NJan Procházka <90197375+P-R-O-C-H-Y@users.noreply.github.com>