net: phy: fixed warning: Function parameter not described

Fixed warning: Function parameter or member 'enable' not
described in 'genphy_c45_fast_retrain'

Signed-off-by: Luo Jie <[e-mail]>
Reviewed-by: Russell King (Oracle) <[e-mail]>
Reviewed-by: Andrew Lunn <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/phy/phy-c45.c

···
 /**
  * genphy_c45_fast_retrain - configure fast retrain registers
  * @phydev: target phy_device struct
+ * @enable: enable fast retrain or not
  *
  * Description: If fast-retrain is enabled, we configure PHY as
  *   advertising fast retrain capable and THP Bypass Request, then