feat: fixed another .mdx error

Author: Markkos89

src/pages/lessons/fundamentals/token-standards.mdx

@@ -24,7 +24,7 @@ ensure that the whole system is composable, just like Lego blocks.
 <center>
   Web3 developers design and audit token standards to ensure an interoperable
   ecosystem
-</center>{" "}
+</center>
 
 Since we are using the Ethereum Network in our lessons track, we’ll use the
 Ethereum ecosystem as our basis for explanation here.