Docs fixes (#115)

Co-authored-by: Philipp Kant <[email protected]>

documentation/introduction.md

@@ -5,7 +5,7 @@ can be found on [github](https://github.com/MinaFoundation/mina-fungible-token),
 [npm package](https://www.npmjs.com/package/mina-fungible-token).
 
 The fungible token standard uses Mina's native support for custom tokens (see
-[MIP-4](https://github.com/MinaProtocol/MIPs/blob/main/MIPS/mip-zkapps.md#token-mechanics)). An
+[MIP-4](https://github.com/MinaProtocol/MIPs/blob/main/MIPS/mip-0004-zkapps.md#token-mechanics)). An
 account on Mina can be created to hold either Mina, or a custom token.
 
 To create a new token, one creates a smart contract, which becomes the owner for the token, and uses

documentation/use_in_zk_app.md

@@ -9,28 +9,32 @@ Interacting with tokens from a zkApp is as simple as writing off-chain code (sam
 previous chapter is executed from within zkApp methods):
 
 ```ts
+import { DeployArgs, method, PublicKey, SmartContract, State, state, UInt64 } from "o1js"
+
+import { FungibleToken } from "mina-fungible-token"
+
 export class TokenEscrow extends SmartContract {
   @state(PublicKey)
   tokenAddress = State<PublicKey>()
   @state(UInt64)
   total = State<UInt64>()
 
-  deploy(args: DeployArgs & { tokenAddress: PublicKey }) {
+  async deploy(args: DeployArgs & { tokenAddress: PublicKey }) {
     super.deploy(args)
     this.tokenAddress.set(args.tokenAddress)
     this.total.set(UInt64.zero)
   }
 
   @method
-  deposit(from: PublicKey, amount: UInt64) {
+  async deposit(from: PublicKey, amount: UInt64) {
     const token = new FungibleToken(this.tokenAddress.getAndRequireEquals())
     token.transfer(from, this.address, amount)
     const total = this.total.getAndRequireEquals()
     this.total.set(total.add(amount))
   }
 
   @method
-  withdraw(to: PublicKey, amount: UInt64) {
+  async withdraw(to: PublicKey, amount: UInt64) {
     const token = new FungibleToken(this.tokenAddress.getAndRequireEquals())
     const total = this.total.getAndRequireEquals()
     total.greaterThanOrEqual(amount)