add table formatting

Author: gaonip

docs/pages/concepts/trading/rewards/index.mdx

@@ -68,8 +68,8 @@ Refer to the dydx frontend [fees page](https://dydx.trade/portfolio/fees) for th
 - Staking discounts do not apply to maker rebates (negative fees) 
 - The dYdX community [voted](https://www.mintscan.io/dydx/proposals/310) to set the staking fee discounts below. Staking fee discounts can be changed at any time with a dYdX governance proposal. When staking thresholds are not defined by the dYdX community for a particular tier, the staking discount defaults to 0%
 
-| Tier  | Discount 1  | Discount 2 | 
-|-------|-----------------------|-------------|
+| Tier  | Discount 1  | | Discount 2 | |
+|-------|--------------|---------|--------|-----|
 |       | Number of dYdX | Discount | Number of dYdX | Discount |
 | 1     | 3,000                 | 25%         |  20,000  | 50%           | 
 | 2    | 20,000                  | 20%        | 80,000   | 45%           |