spi: spi-mem: Add missing word in the SPI_MEM_DATA_OUT description

Missing 'to' in the SPI_MEM_DATA_OUT description.
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

include/linux/spi/spi-mem.h

@@ -58,7 +58,7 @@
  * enum spi_mem_data_dir - describes the direction of a SPI memory data
  *			   transfer from the controller perspective
  * @SPI_MEM_DATA_IN: data coming from the SPI memory
- * @SPI_MEM_DATA_OUT: data sent the SPI memory
+ * @SPI_MEM_DATA_OUT: data sent to the SPI memory
  */
 enum spi_mem_data_dir {
 	SPI_MEM_DATA_IN,