mlxsw: Update specification of reg_ritr_type

The comments really belong to the individual enumerators. The comment
at the register should instead reference the enum.
Signed-off-by: NPetr Machata <petrm@mellanox.com>
Signed-off-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/reg.h

@@ -3992,16 +3992,16 @@ MLXSW_ITEM32(reg, ritr, ipv4, 0x00, 29, 1);
 MLXSW_ITEM32(reg, ritr, ipv6, 0x00, 28, 1);
 
 enum mlxsw_reg_ritr_if_type {
+	/* VLAN interface. */
 	MLXSW_REG_RITR_VLAN_IF,
+	/* FID interface. */
 	MLXSW_REG_RITR_FID_IF,
+	/* Sub-port interface. */
 	MLXSW_REG_RITR_SP_IF,
 };
 
 /* reg_ritr_type
- * Router interface type.
- * 0 - VLAN interface.
- * 1 - FID interface.
- * 2 - Sub-port interface.
+ * Router interface type as per enum mlxsw_reg_ritr_if_type.
  * Access: RW
  */
 MLXSW_ITEM32(reg, ritr, type, 0x00, 23, 3);