drm/msm/dpu: correct struct dpu_encoder_virt docs

Fix a typo in struct dpu_encoder_virt kerneldoc, which made it ignore
description of the cwb_mask field.

Fixes: dd33140 ("drm/msm/dpu: Configure CWB in writeback encoder")
Signed-off-by: Dmitry Baryshkov <lumag@kernel.org>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Patchwork: https://patchwork.freedesktop.org/patch/641315/
Link: https://lore.kernel.org/r/20250306-dpu-fix-docs-v1-2-e51b71e8ad84@kernel.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Author: lumag

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c

@@ -139,7 +139,7 @@ enum dpu_enc_rc_states {
  *			num_phys_encs.
  * @hw_dsc:		Handle to the DSC blocks used for the display.
  * @dsc_mask:		Bitmask of used DSC blocks.
- * @cwb_mask		Bitmask of used CWB muxes
+ * @cwb_mask:		Bitmask of used CWB muxes
  * @intfs_swapped:	Whether or not the phys_enc interfaces have been swapped
  *			for partial update right-only cases, such as pingpong
  *			split where virtual pingpong does not generate IRQs