Update custom-saml.mdx

upstream params

Author: clairekinde11

src/content/docs/authenticate/enterprise-connections/custom-saml.mdx

@@ -92,10 +92,11 @@ Depending on your SAML set up, you may need to include advanced configurations f
 
 14. (Temporary feature) Select if you want to treat this connection as a trusted provider. A [trusted provider](/authenticate/about-auth/identity-and-verification/) is one that guarantees the email they issue is verified.
 15. (Optional) In the **Sign SAML request** section, paste in the **Signed certificate** and **Private key**. You may have got these from your IdP or you may have generated yourself (see procedure above).
-16. Switch on the connection. This will make it instantly available to users if this is your production environment.
+16. Enter any [upstream params](/authenticate/enterprise-connections/advanced-saml-configurations/#upstream-parameters) that you want to pass to the identity provider. Not all providers support this, so check their documentation first.
+17. Switch on the connection. This will make it instantly available to users if this is your production environment.
     1. For environment-level connections, scroll down and select the apps that will use the auth method.
     2. For organization-level connections, scroll down and select if you want to switch this on for the org. 
-17. Select **Save**.
+18. Select **Save**.
 
 Next: Complete any additional configuration in your identity provider’s settings, such as adding the **Entity ID** and **return URL**.