[Images] Fix broken cURL command (#17191)

Author: maxgoedjen

src/content/docs/images/get-started.mdx

@@ -19,7 +19,7 @@ Refer to [Find zone and account IDs](/fundamentals/setup/find-account-and-zone-i
 ```bash
 curl --request POST \
   --url https://api.cloudflare.com/client/v4/accounts/<ACCOUNT_ID>/images/v1 \
-  --header 'Authorization: <API_TOKEN> \
+  --header 'Authorization: Bearer <API_TOKEN>' \
   --header 'Content-Type: multipart/form-data' \
   --form file=@./<YOUR_IMAGE.IMG>
 ```