fix(docs): Dapp tutorial edits

[critesjosh]

closes: https://github.com/AztecProtocol/dev-rel/issues/383

[critesjosh]

This function is still failing

async function showPublicBalances(pxe) {
    const accounts = await pxe.getRegisteredAccounts();
    const token = await getToken(pxe);

    for (const account of accounts) {
        const balance = await token.methods.balance_of_public(account.address).simulate();
        console.log(`Balance of ${account.address}: ${balance}`);
    }
}

Error in app: Error: (JSON-RPC PROPAGATED) Method not found: pxe_createTxExecutionRequest

[AztecBot]

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