slip-0173: reformat table

slip-0173.md

@@ -21,16 +21,12 @@ The BIP repository does not want to deal with assigning the values for various c
 
 These are the registered human-readable parts for usage in Bech32 encoding of witness programs.
 
-hrp    | coin
--------|--------------------------------
-`bc`   | [Bitcoin](https://bitcoin.org/)
-`tb`   | Bitcoin Testnet
-`ltc`  | [Litecoin](https://litecoin.org/)
-`tltc` | Litecoin Testnet
-`vtc`  | [Vertcoin](https://vertcoin.org/)
-`tvtc` | Vertcoin Testnet
-`btg`  | [Bitcoin Gold](https://bitcoingold.org/)
-`tbtg` | Bitcoin Gold testnet
+hrp   | coin                                     | hrp    | coin                 |
+------|------------------------------------------|--------|----------------------|
+`bc`  | [Bitcoin](https://bitcoin.org/)          | `tb`   | Bitcoin Testnet      |
+`ltc` | [Litecoin](https://litecoin.org/)        | `tltc` | Litecoin Testnet     |
+`vtc` | [Vertcoin](https://vertcoin.org/)        | `tvtc` | Vertcoin Testnet     |
+`btg` | [Bitcoin Gold](https://bitcoingold.org/) | `tbtg` | Bitcoin Gold Testnet |
 
 ## Libraries