man: document recent changes

This drops documentation of KERNEL_INSTALL_MACHINE_ID as machine-info
field (though we'll still read it for compat).

This updates the kernel-install man page to always say "ENTRY-TOKEN"
instead of "MACHINE-ID" where appropriate, to clear the confusion up
between the two.

This also tries to fix how we denote env vars (always prefix with $ and
without = suffix), and other vars (without $ but with = suffix)

Other fixes.

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