net: phy-c45: Fix genphy_c45_ethtool_set_eee description

The text has been cut/paste from genphy_c45_ethtool_get_eee but not
changed to reflect it performs set.

Additionally, extend the comment. This function implements the logic
that eee_enabled has global control over EEE. When eee_enabled is
false, no link modes will be advertised, and as a result, the MAC
should not transmit LPI.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20230619220332.4038924-1-andrew@lunn.ch
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/phy/phy-c45.c

@@ -1425,12 +1425,15 @@ int genphy_c45_ethtool_get_eee(struct phy_device *phydev,
 EXPORT_SYMBOL(genphy_c45_ethtool_get_eee);
 
 /**
- * genphy_c45_ethtool_set_eee - get EEE supported and status
+ * genphy_c45_ethtool_set_eee - set EEE supported and status
  * @phydev: target phy_device struct
  * @data: ethtool_eee data
  *
- * Description: it reportes the Supported/Advertisement/LP Advertisement
- * capabilities.
+ * Description: sets the Supported/Advertisement/LP Advertisement
+ * capabilities. If eee_enabled is false, no links modes are
+ * advertised, but the previously advertised link modes are
+ * retained. This allows EEE to be enabled/disabled in a
+ * non-destructive way.
  */
 int genphy_c45_ethtool_set_eee(struct phy_device *phydev,
 			       struct ethtool_eee *data)