Changed Request to NextRequest to solve the error (#2215)

Co-authored-by: Alexis Aguilar <98043211+alexisintech@users.noreply.github.com>

Author: SamDingore

docs/webhooks/sync-data.mdx

@@ -105,8 +105,9 @@ These steps apply to any Clerk event. To make the setup process easier, it's rec
     <Tab>
       ```ts {{ filename: 'app/api/webhooks/route.ts' }}
       import { verifyWebhook } from '@clerk/nextjs/webhooks'
+      import { NextRequest } from 'next/server'
 
-      export async function POST(req: Request) {
+      export async function POST(req: NextRequest) {
         try {
           const evt = await verifyWebhook(req)