mtd: spinand: Fix typo in comment

One comment in the SPI-NAND core is not very clear, fix it to ease the
understanding of what the block does.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-mtd/20200930154109.3922-2-miquel.raynal@bootlin.com

drivers/mtd/nand/spi/core.c

@@ -1068,7 +1068,7 @@ static int spinand_init(struct spinand_device *spinand)
 
 	/*
 	 * Right now, we don't support ECC, so let the whole oob
-	 * area is available for user.
+	 * area available for the user.
 	 */
 	mtd->_read_oob = spinand_mtd_read;
 	mtd->_write_oob = spinand_mtd_write;