drm/xe/vf: fix struct xe_gt_sriov_vf_migration kernel-doc

drm/xe/vf: fix struct xe_gt_sriov_vf_migration kernel-doc

Fix kernel-doc warnings on struct xe_gt_sriov_vf_migration:

Warning: ../drivers/gpu/drm/xe/xe_gt_sriov_vf_types.h:47 cannot
  understand function prototype: 'struct xe_gt_sriov_vf_migration'

Fixes: e1d2e2d878bf ("drm/xe/vf: Add xe_gt_recovery_pending helper")
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Tomasz Lis <tomasz.lis@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patch.msgid.link/20260107155401.2379127-2-jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>