If goal is to cover information to the way that even new to custom roms can follow it, then I suggest small changes from the LineageOS wiki, other than that, I think that information is enough:
What I would suggest to change from there, if there will be own device specific page at doc.e.foundation ?
LinageOS wiki has all information needed, but maybe I would highlight that user should update to latest Android 10 based MIUI build available atm, easier than upgrading only fw to phone. Sure that has been said at wiki, but with bit different wordings.
Also that wiki uses LineageOS recovery with step to step using that recovery. It’s not difficult to use those introductions with TWRP (ex. sideload is found at bit different place), but sure for first timer it will be easier to have exactly corresponding step by step quide. With that it sure is need to be decided is TWRP suggested way to go, or is /e/ recovery ready for the device and should it be suggested.
I also would add Redmi Note 8 / 8T to the title like in LineageOS wiki does. Sure Note 8T is actually willow, but it uses same unified ginkgo build (maybe this should be mentioned too), difference afaik is only that Note 8 offers notification led while 8T doesn’t and 8T offers NFC while 8 doesn’t.
Other than that?
Information will device suppport OTA updates and if not, what is recommended way to upgrade.
That’s what comes up to mind quickly thinking