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/bcm7xxx.c b/drivers/net/phy/bcm7xxx.c
index 421feb8..29b1c88 100644
--- a/drivers/net/phy/bcm7xxx.c
+++ b/drivers/net/phy/bcm7xxx.c
@@ -565,7 +565,7 @@ static int bcm7xxx_28nm_set_tunable(struct phy_device *phydev,
 	if (ret)
 		return ret;
 
-	/* Disable EEE advertisment since this prevents the PHY
+	/* Disable EEE advertisement since this prevents the PHY
 	 * from successfully linking up, trigger auto-negotiation restart
 	 * to let the MAC decide what to do.
 	 */