The new-format reference describes the block format on its own terms,
which is the wrong lookup direction for someone holding a legacy
one-liner. Aaron migrated Finix OS from the PR description, proving
the need for a token-in, key-out mapping in the user guide.
One table per part of a stanza, worked conversions for the shapes
that changed structurally -- cgroup selection and the three tty
variants -- and the dropped tokens listed with their replacements.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
