replace image for snap tutorial

snaps/learn/tutorials/gas-estimation.md

@@ -150,7 +150,7 @@ Open `packages/snap/src/index.ts`.
 This is the main code file for your Snap.
 To get a gas fee estimate, use the public API endpoint provided by
 [Open Source Ethereum Explorer](https://beaconcha.in/).
-If it not already present, add the following `getFees()` function to the beginning of the `/packages/snap/src/index.ts` file:
+If it is not already present, add the following `getFees()` function to the beginning of the `/packages/snap/src/index.ts` file:
 
 ```typescript title="index.ts"
 import type { OnRpcRequestHandler } from "@metamask/snaps-sdk";
@@ -240,7 +240,7 @@ You have integrated a public API into MetaMask and displayed real-time gas fee e
 If you click the **Send message** button and receive an error message similar to the following, update `packages/site/src/pages/index.tsx`:
 
 <p align="center">
-<img src="https://github.com/MetaMask/metamask-docs/assets/5465932/a22481a0-30d5-4efd-8cc5-c42db70f7eb1" alt="An error happened" width="400px" style={{border: '1px solid #DCDCDC'}} />
+<img src={require('../../assets/snaps-error-gas-estimation.png').default}" alt="Button error for gas estimation" width="400px" style={{border: '1px solid #DCDCDC'}} />
 </p>
 
 Replace `await invokeSnap({ method: 'hello' })` on line 114 of `packages/site/src/pages/index.tsx` with the following code:

snaps/learn/tutorials/transaction-insights.md

@@ -203,7 +203,7 @@ if (typeof transaction.data === "string" && transaction.data !== "0x") {
 }
 ```
 
-### 6. Next steps
+## Next steps
 
 The initial project has generic names in multiple places.
 You can update the fields in `snap.manifest.json` to match your custom Snap: