change insight auth in docs

Author: iuwqyir

apps/portal/src/app/insight/get-started/page.mdx

@@ -17,6 +17,7 @@ In this guide we will learn how to use the events blueprint in insight.
 ## Pre-requisites
 
 - [Create a project](https://thirdweb.com/team) and navigate to the project settings to get a clientId
+- Use that client ID in the `x-client-id` header to authenticate
 - Use insight API with the base URL below
 
 ```
@@ -27,7 +28,11 @@ https://<chain-id>.insight.thirdweb.com
 ```typescript
 const getUsdtTransfers = async () => {
  try {
-   const response = await fetch('https://1.insight.thirdweb.com/v1/<client-id>/events/0xdAC17F958D2ee523a2206206994597C13D831ec7/Transfer(address,address,uint256)?limit=5');
+   const response = await fetch('https://1.insight.thirdweb.com/v1/events/0xdAC17F958D2ee523a2206206994597C13D831ec7/Transfer(address,address,uint256)?limit=5', {
+    headers: {
+      'x-client-id': <YOUR_THIRDWEB_CLIENT_ID>
+    }
+   });
    const transfersInfo = await response.json();
    return transfersInfo
  } catch (error) {