M280 “Almost all servos accept a pulse width range of at least 1us to 2us” should imho be 1ms to 2ms.
If you have not endstops connected to the Duet, DWC displays status Endstop hit Yes, this is a bit confusing. Maybe it’s possible to have a status like ? if there is no endstop connected.
I would add a link to a troubleshooting guide if the connection does not work. E.g. if the router blocks unknown MAC addresses, conflicting IP addresses etc.
At the beginning I would add “If you have a Duet WiFi, then…”, same in Step 8. It is implicit in the title, but can be overread.