drm/xe: Fix kerneldoc for xe_migrate_exec_queue

Correct the function name in the kerneldoc.
It is for below warning:
"Warning: drivers/gpu/drm/xe/xe_migrate.c:1262 expecting prototype for
xe_get_migrate_exec_queue(). Prototype was for xe_migrate_exec_queue()
instead"

Fixes: 916ee47 ("drm/xe/vf: Register CCS read/write contexts with Guc")
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patch.msgid.link/20260129233834.419977-6-shuicheng.lin@intel.com
(cherry picked from commit 9fd8da7)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

Author: ShuichengLin

drivers/gpu/drm/xe/xe_migrate.c

@@ -1254,7 +1254,7 @@ void xe_migrate_ccs_rw_copy_clear(struct xe_bo *src_bo,
 }
 
 /**
- * xe_get_migrate_exec_queue() - Get the execution queue from migrate context.
+ * xe_migrate_exec_queue() - Get the execution queue from migrate context.
  * @migrate: Migrate context.
  *
  * Return: Pointer to execution queue on success, error on failure