Update apps/portal/src/app/ai/chat/migrate-from-nebula/page.mdx

Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>
Signed-off-by: samina <[email protected]>

Author: saminacodes

apps/portal/src/app/ai/chat/migrate-from-nebula/page.mdx

@@ -35,7 +35,7 @@ to migrate to the thirdweb API.
 Before (Nebula API)
 
 ```typescript
-fetch("<https://nebula-api.thirdweb.com/chat>", {
+fetch("https://nebula-api.thirdweb.com/chat", {
   method: "POST",
   headers: {
     "Content-Type": "application/json",