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Replace references to cron.update_migration_post_id with cron.update_migration_poster_id in docs (#11068)

Across several files, references to cron.update_migration_post_id are made, although the actual setting is called cron.update_migration_poster_id according to modules/setting/cron.go (https://github.com/go-gitea/gitea/blob/10e2f291442fdc7efc31c02f5ffcba79a36db9ac/modules/setting/cron.go#L54

).
Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>