Dear NextCloud team:
On 2020-11-02 @ 20:40:44 the LetsEncrypt certificates of docs.nextcloud.com have expired.
As a result I am not able to access the documentation because of the HSTS policy in place.
Please renew the certificates in question.
I registered an account to also provide evidence of this. I’m happy this support forum works so well, it showed me the duplicate post.
admittedly I was going to place the thread under ‘meta’ knowing it wasn’t quite right
I am having the same issue trying to upgrade my installation which uses “download.nextcloud.com”. I’m guessing their certbot broke 
I can confirm this. And it’s not only this domain:
https://docs.nextcloud.com/ - certificate expired 2020-11-03, 02:40:14 UTC
https://download.nextcloud.com/ - certificate expired 2020-11-03, 02:40:44 UTC
Hey Siri…“certbot renew” 
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Has been fixed as of: Saturday, 3 October 2020 at 20:40:44 Central Standard Time