phy: fix kdoc warning

Kdoc does not like it when multiline comment follows the networking
style of starting right on the first line:

include/linux/phy.h:869: warning: Function parameter or member 'config_intr' not described in 'phy_driver'

Link: https://lore.kernel.org/r/20201215063750.3120976-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

include/linux/phy.h

@@ -743,7 +743,8 @@ struct phy_driver {
 	/** @read_status: Determines the negotiated speed and duplex */
 	int (*read_status)(struct phy_device *phydev);
 
-	/** @config_intr: Enables or disables interrupts.
+	/**
+	 * @config_intr: Enables or disables interrupts.
 	 * It should also clear any pending interrupts prior to enabling the
 	 * IRQs and after disabling them.
 	 */