As is well known among the community, the online documentation has moved from https://docs.hubitat.com to https://docs2.hubitat.com . The one problem that this has caused is that the big search engines: Google, Bing, Yahoo, Duckduckgo, etc. are all still showing links to https://docs.hubitat.com when you search for documentation issues.
e.g. searching for "Hubitat driver capability list" in every search engine I've tried sends me to https://docs.hubitat.com/index.php?title=Driver_Capability_List which then fails to load. A brief test with curl.exe indicates that there isn't even a web server listening on that host.
Is there any chance that you can set up a simple redirect so that any request sent to https://docs.hubitat.com/anything is redirected to https://docs2.hubitat.com/
You could even do that using the same physical server. Just set up a CNAME DNS record that points docs.hubitat.com to docs2.hubitat.com, use virtual hosting to issue the 301 Moved permanently, and then when you fetch the certificate from Lets Encrypt, ask them to include docs.hubitat.com as a second Subject Alternative Name on the current certificate you've got for docs2.