drm/vmwgfx: Fix kernel-doc warnings for vmwgfx_fence

Add missing descriptions for vmw_event_fence_action_seq_passed.

This fixes the following warnings:
drivers/gpu/drm/vmwgfx/vmwgfx_fence.c:526 function parameter 'f'
	not described in 'vmw_event_fence_action_seq_passed'
drivers/gpu/drm/vmwgfx/vmwgfx_fence.c:526 function parameter 'cb'
	not described in 'vmw_event_fence_action_seq_passed'

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202507040807.jKTxWGVQ-lkp@intel.com/
Signed-off-by: Bartlomiej Kubik <kubik.bartlomiej@gmail.com>
Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Link: https://lore.kernel.org/all/20251211181044.4098689-1-kubik.bartlomiej@gmail.com/

Author: Bartekkubik

drivers/gpu/drm/vmwgfx/vmwgfx_fence.c

@@ -515,12 +515,12 @@ int vmw_fence_obj_unref_ioctl(struct drm_device *dev, void *data,
 /**
  * vmw_event_fence_action_seq_passed
  *
- * @action: The struct vmw_fence_action embedded in a struct
- * vmw_event_fence_action.
+ * @f: The struct dma_fence which provides timestamp for the action event
+ * @cb: The struct dma_fence_cb callback for the action event.
  *
- * This function is called when the seqno of the fence where @action is
- * attached has passed. It queues the event on the submitter's event list.
- * This function is always called from atomic context.
+ * This function is called when the seqno of the fence has passed
+ * and it is always called from atomic context.
+ * It queues the event on the submitter's event list.
  */
 static void vmw_event_fence_action_seq_passed(struct dma_fence *f,
 					      struct dma_fence_cb *cb)