adds missing async to connect docs (#5789)

## Problem solved

Adds missing `async` to connect callbacks in documentation

<!-- start pr-codex -->

---

## PR-Codex overview
This PR focuses on updating the `connect` function calls in multiple files to use an asynchronous arrow function instead of a regular function. This change enhances the handling of asynchronous operations within the `connect` function.

### Detailed summary
- Updated `connect` function calls in `page.mdx` files to use `async () =>` instead of `() =>`.
- Changes made in:
  - `apps/portal/src/app/connect/in-app-wallet/custom-auth/configuration/page.mdx`
  - `apps/portal/src/app/connect/in-app-wallet/guides/build-your-own-ui/page.mdx`
  - `apps/portal/src/app/react/v5/in-app-wallet/build-your-own-ui/page.mdx`

> ✨ Ask PR-Codex anything about this PR by commenting with `/codex {your question}`

<!-- end pr-codex -->

apps/portal/src/app/connect/in-app-wallet/custom-auth/configuration/page.mdx

@@ -146,7 +146,7 @@ import { useConnect } from "thirdweb/react";
 const { connect } = useConnect();
 
 const handlePostLogin = async (jwt: string) => {
-	await connect(() => {
+	await connect(async () => {
 		const wallet = inAppWallet();
 		await wallet.connect({
 			client,

apps/portal/src/app/connect/in-app-wallet/guides/build-your-own-ui/page.mdx

@@ -79,7 +79,7 @@ import { useConnect } from "thirdweb/react";
 const { connect } = useConnect();
 
 const handleLogin = async () => {
-	await connect(() => {
+	await connect(async () => {
 		const wallet = inAppWallet();
 		await wallet.connect({
 			client,
@@ -137,7 +137,7 @@ const preLogin = async (email: string) => {
 
 const handleLogin = async (email: string, verificationCode: string) => {
 	// verify email and connect
-	await connect(() => {
+	await connect(async () => {
 		const wallet = inAppWallet();
 		await wallet.connect({
 			client,
@@ -194,7 +194,7 @@ import { inAppWallet, hasStoredPasskey } from "thirdweb/wallets/in-app";
 const { connect } = useConnect();
 
 const handleLogin = async () => {
-	await connect(() => {
+	await connect(async () => {
 		const wallet = inAppWallet();
 		const hasPasskey = await hasStoredPasskey(client);
 		await wallet.connect({

apps/portal/src/app/react/v5/in-app-wallet/build-your-own-ui/page.mdx

@@ -82,7 +82,7 @@ import { useConnect } from "thirdweb/react";
 const { connect } = useConnect();
 
 const handleLogin = async () => {
-	await connect(() => {
+	await connect(async () => {
 		const wallet = inAppWallet();
 		await wallet.connect({
 			client,
@@ -113,7 +113,7 @@ const preLogin = async (email: string) => {
 
 const handleLogin = async (email: string, verificationCode: string) => {
 	// verify email and connect
-	await connect(() => {
+	await connect(async () => {
 		const wallet = inAppWallet();
 		await wallet.connect({
 			client,
@@ -144,7 +144,7 @@ const preLogin = async (phoneNumber: string) => {
 
 const handleLogin = async (phoneNumber: string, verificationCode: string) => {
 	// verify phone number and connect
-	await connect(() => {
+	await connect(async () => {
 		const wallet = inAppWallet();
 		await wallet.connect({
 			client,
@@ -171,7 +171,7 @@ import { inAppWallet, hasStoredPasskey } from "thirdweb/wallets/in-app";
 const { connect } = useConnect();
 
 const handleLogin = async () => {
-	await connect(() => {
+	await connect(async () => {
 		const wallet = inAppWallet({
 			auth: {
 				passkeyDomain: "example.com", // defaults to current url