drm/xe: fix kernel-doc function name mismatch in xe_pm.c

drm/xe: fix kernel-doc function name mismatch in xe_pm.c

Documentation build reported:

   WARNING: ./drivers/gpu/drm/xe/xe_pm.c:131 expecting prototype for xe_pm_might_block_on_suspend(). Prototype was for xe_pm_block_on_suspend() instead

The kernel-doc comment for xe_pm_block_on_suspend() incorrectly used
the function name xe_pm_might_block_on_suspend(). Fix the header to
match the actual function prototype.

No functional changes.

Fixes: f73f6dd312a5 ("drm/xe/pm: Add lockdep annotation for the pm_block completion")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202511061736.CiuroL7H-lkp@intel.com/
Signed-off-by: Kriish Sharma <kriish.sharma2006@gmail.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patch.msgid.link/20251110184206.2113830-1-kriish.sharma2006@gmail.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>