Bug#992345: www.debian.org: bullseye release-notes are misleading about the needed disk space

Package: www.debian.org
Severity: important

The bullseye release-notes at

  https://www.debian.org/releases/bullseye/amd64/release-notes/ch-upgrading.en.html

are misleading about the needed disk space.

"apt -o APT::Get::Trivial-Only=true full-upgrade" was saying

649 upgraded, 113 newly installed, 11 to remove and 1 not upgraded.
Need to get 455 MB of archives.
After this operation, 558 MB of additional disk space will be used.

and I had around 650 MB free space, but the upgrade failed due to
lack of disk space when processing the new Linux kernel
(linux-image-5.10.0-8-amd64_5.10.46-4_amd64.deb). I tried to
complete the upgrade after another "apt clean", but this wasn't
enough (and increasing the disk space couldn't be done without
rebooting).

I suspect that some packages like this one need a lot of temporary
disk space (could this be related to initrd before compression?).
But there is nothing about that in the release notes. And perhaps
a warning should have been output by apt.