Update page.mdx

Signed-off-by: samina <[email protected]>

Author: saminacodes

apps/portal/src/app/nebula/api-reference/chat/page.mdx

@@ -2,7 +2,7 @@ import { EndpointMetadata } from './EndpointMetadata';
 
 <EndpointMetadata />
 
-## Chat Actions
+# Chat Actions
 
 Chat actions represent blockchain transactions or operations that Nebula has prepared in response to your request. The response includes both a detailed explanation in the `message` field and the actual transaction data in the `actions` array.
 
@@ -113,4 +113,4 @@ const response = await fetch('https://nebula-api.thirdweb.com/chat', {
 
 const data = await response.json();
 const result = await handleNebulaResponse(data);
-```
+```