What does the Auto Hotspot setting do on the Apple Watch? When taking a look at the Apple Support article that explains how to manually connect an Apple Watch to Wi-Fi (https://support.apple.com/en-us/HT209071), the page makes a mention to a setting entitled "Auto Hotspot". I haven't been able to find any other references to this setting - would somebody be able to explain what it does?
A hot spot is when another device with cellular data broadcasts Wi-Fi connectivity. 

This setting allows you to automatically join those Wi-Fi, prompt you to join them or disables joining them.