drm/xe: Fix broken kernel-doc for the struct xe_bo

Use correct multi-line kernel-doc style if required.
Some members were described only in the commit message.
Some other members were described using wrong names.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Cc: Satyanarayana K V P <satyanarayana.k.v.p@intel.com>
Reviewed-by: Satyanarayana K V P <satyanarayana.k.v.p@intel.com>
Link: https://lore.kernel.org/r/20250904144026.7222-1-michal.wajdeczko@intel.com