net: phy: Fix spelling mistake: "advertisment"-> "advertisement"

Trivial fix to spelling mistake in comments and error message text.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
index 22d9bc9..98fd6b7 100644
--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -860,7 +860,7 @@ static int m88e1510_config_init(struct phy_device *phydev)
 			return err;
 
 		/* There appears to be a bug in the 88e1512 when used in
-		 * SGMII to copper mode, where the AN advertisment register
+		 * SGMII to copper mode, where the AN advertisement register
 		 * clears the pause bits each time a negotiation occurs.
 		 * This means we can never be truely sure what was advertised,
 		 * so disable Pause support.