migration/docs: Update postcopy recover session for SETUP phase

Firstly, the "Paused" state was added in the wrong place before. The state
machine section was describing PostcopyState, rather than M

migration/docs: Update postcopy recover session for SETUP phase

Firstly, the "Paused" state was added in the wrong place before. The state
machine section was describing PostcopyState, rather than MigrationStatus.
Drop the Paused state descriptions.

Then in the postcopy recover session, add more information on the state
machine for MigrationStatus in the lines. Add the new RECOVER_SETUP phase.

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Peter Xu <peterx@redhat.com>
[fix typo s/reconnects/reconnect]
Signed-off-by: Fabiano Rosas <farosas@suse.de>

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docs/migration: Organize "Postcopy" page

Reorganize the page, moving things around, and add a few
headlines ("Postcopy internals", "Postcopy features") to cover sub-areas.

Reviewed-by: Cédric Le Go

docs/migration: Organize "Postcopy" page

Reorganize the page, moving things around, and add a few
headlines ("Postcopy internals", "Postcopy features") to cover sub-areas.

Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20240109064628.595453-9-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>

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docs/migration: Split "Postcopy"

Split postcopy into a separate file. Introduce a head page "features.rst"
to keep all the features on top of migration framework.

Reviewed-by: Cédric Le Goater <cl

docs/migration: Split "Postcopy"

Split postcopy into a separate file. Introduce a head page "features.rst"
to keep all the features on top of migration framework.

Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20240109064628.595453-7-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>

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