fix: typo in with-stripe-typescript example (#56274)

fixes #56273.

examples/with-stripe-typescript/app/api/webhooks/route.ts

@@ -51,7 +51,7 @@ export async function POST(req: Request) {
           console.log(`💰 PaymentIntent status: ${data.status}`)
           break
         default:
-          throw new Error(`Unhhandled event: ${event.type}`)
+          throw new Error(`Unhandled event: ${event.type}`)
       }
     } catch (error) {
       console.log(error)