Fix links from Aptos Token Standard to Coin and Token for GitHub Mark…

…down users (aptos-labs#5881)

developer-docs-site/docs/concepts/coin-and-token/index.md

@@ -14,20 +14,20 @@ The documentation in this section comprises the Aptos Token Standard. See the pa
 
 For digital assets, Aptos provides two Move modules:
 
-## [Aptos Coin](aptos-coin)
+## [Aptos Coin](./aptos-coin.md)
 
 The [`coin.move`](https://github.com/aptos-labs/aptos-core/blob/main/aptos-move/framework/aptos-framework/sources/coin.move) is a lightweight standard meant for simple, typesafe, and fungible assets. The coin standard is separated out into its own Move module to ensure that:
   - The coin standard can be used to create a token with an emphasis on simplicity and performance and with minimal metadata. 
   - The coin module remains a part of the Aptos core framework and can be used for currencies, for example the gas currency, thereby enhancing the core functionality of the Aptos framework.
 
-See [Aptos Coin >](aptos-coin)
+See [Aptos Coin >](./aptos-coin.md)
 
-## [Aptos Token](aptos-token)
+## [Aptos Token](./aptos-token.md)
 
 The [`token.move`](https://github.com/aptos-labs/aptos-core/blob/main/aptos-move/framework/aptos-token/sources/token.move) Move module, on the other hand:
 
 - Encapsulates rich, flexible assets, fungible and nonfungible, and collectibles. 
 - The token standard is deployed as a separate package at the Aptos blockchain address `0x3`. 
 - The token standard is designed to create an NFT or a semi-fungible or a fungible non-decimal token, with rich metadata and functionalities. A token definition of this type can be iterated rapidly to respond to the platform and user requirements. 
 
-See [Aptos Token >](aptos-token)
+See [Aptos Token >](./aptos-token.md)