Update the migrate_cancel command documentation with a few words about
postcopy and the expected state of the machine after migration.

Acked-by: Markus Armbruster <arm...@redhat.com>
Reviewed-by: Peter Xu <pet...@redhat.com>
Signed-off-by: Fabiano Rosas <faro...@suse.de>
---
 qapi/migration.json | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/qapi/migration.json b/qapi/migration.json
index 43babd1df4..8b9c53595c 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -1524,7 +1524,9 @@
 ##
 # @migrate_cancel:
 #
-# Cancel the current executing migration process.
+# Cancel the currently executing migration process.  Allows a new
+# migration to be started right after.  When postcopy-ram is in use,
+# cancelling is not allowed after the postcopy phase has started.
 #
 # .. note:: This command succeeds even if there is no migration
 #    process running.
-- 
2.35.3


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