drm/vmwgfx/vmwgfx_cmdbuf: Fix misnaming of 'headers' should be plural

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c:137: warning: Function parameter or member 'headers' not described in 'vmw_cmdbuf_man'

Cc: VMware Graphics <linux-graphics-maintainer@vmware.com>
Cc: Roland Scheidegger <sroland@vmware.com>
Cc: Zack Rusin <zackr@vmware.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Zack Rusin <zackr@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210115181601.3432599-2-lee.jones@linaro.org

drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c

@@ -89,7 +89,7 @@ struct vmw_cmdbuf_context {
  * @max_hw_submitted: Max number of in-flight command buffers the device can
  * handle. Immutable.
  * @lock: Spinlock protecting command submission queues.
- * @header: Pool of DMA memory for device command buffer headers.
+ * @headers: Pool of DMA memory for device command buffer headers.
  * Internal protection.
  * @dheaders: Pool of DMA memory for device command buffer headers with trailing
  * space for inline data. Internal protection.