Bug#977653: Please document rate limits on snapshots.debian.org

[Thomas Lange <lange@cs.uni-koeln.de>]

Package: snapshot.debian.org

The script fai-mirror downloads a list of packages to create a local
package repo for an unattended installation ISO image. When using
snapshots.debian.org in the sources.list file,
users will sometimes see refused connections like this:

 Err:1 http://snapshot.debian.org/archive/debian/20201101T025945Z buster/main amd64 fonts-quicksand all 0.2016-2
   502  Connection refused [IP: 193.62.202.27 80]
 Err:2 http://snapshot.debian.org/archive/debian/20201101T025945Z buster/main amd64 desktop-base all 10.0.2
   502  Connection refused [IP: 193.62.202.27 80]


It turns out that it may come from the rate limits that are set. See
https://lists.debian.org/debian-snapshot/2018/12/msg00004.html

Please, please document this on the web page of snapshots.debian.org.
-- 
regards Thomas