mlxsw: spectrum_router: Clarify a comment

"Reserved for X" usually means that only X is supposed to use a given
object. Here, it is used in the sense that X should consider the object
"reserved", as in "restricted".

Replace the comment simply by "X", with the implication that that's where
the field is used.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c

@@ -96,8 +96,8 @@ struct mlxsw_sp_rif_subport {
 struct mlxsw_sp_rif_ipip_lb {
 	struct mlxsw_sp_rif common;
 	struct mlxsw_sp_rif_ipip_lb_config lb_config;
-	u16 ul_vr_id; /* Reserved for Spectrum-2. */
-	u16 ul_rif_id; /* Reserved for Spectrum. */
+	u16 ul_vr_id;	/* Spectrum-1. */
+	u16 ul_rif_id;	/* Spectrum-2+. */
 };
 
 struct mlxsw_sp_rif_params_ipip_lb {