net: axienet: Modify function description

Delete duplicate words of "the".

Signed-off-by: Deming Wang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ethernet/xilinx/xilinx_axienet_mdio.c

···
  * Return:	0 on success, -ETIMEDOUT on a timeout
  *
  * Writes the value to the requested register by first writing the value
- * into MWD register. The the MCR register is then appropriately setup
+ * into MWD register. The MCR register is then appropriately setup
  * to finish the write operation.
  */
 static int axienet_mdio_write(struct mii_bus *bus, int phy_id, int reg,