Update pregen docs (#4795)

Signed-off-by: Joaquim Verges <joaquim.verges@gmail.com>

apps/portal/src/app/connect/ecosystems/pregenerate-wallets/page.mdx

@@ -41,6 +41,7 @@ Use this when [bringing your own authentication method](/connect/in-app-wallet/c
 You need to include the following headers:
 
 - `x-ecosystem-id`: Your ecosystem ID
+- `x-ecosystem-partner-id`: Your ecosystem partner ID
 - `x-secret-key`: Your secret key for authentication
 - `Content-Type`: Must be set to `application/json`
 
@@ -51,6 +52,7 @@ Here's an example curl command to pregenerate an embedded wallet:
 ```bash
 curl -X POST 'https://embedded-wallet.thirdweb.com/api/v1/pregenerate' \
   -H 'x-ecosystem-id: ecosystem.example-eco-123' \
+  -H 'x-ecosystem-partner-id: 1415d24e-c7b0-4fce-846e-740841ef2c32' \
   -H 'x-secret-key: 9f8e7d6c5b4a3f2e1d0c9b8a7ffge434b2a1f0e9d8c7b6a5f4e3d2c1b0a9f8e7' \
   -H 'Content-Type: application/json' \
   -d '{