docs(dashboard): add back in enterprise pricing notice (#3339)

Author: devalog

fern/products/dashboard/pages/sso.mdx

@@ -3,6 +3,8 @@ title: Set up Single Sign-On (SSO)
 description: Let teammates sign in to Fern with your IdP (SAML or OIDC)
 ---
 
+<Markdown src="/snippets/enterprise-plan.mdx" />
+
 Set up Single Sign-On (SSO) to sign in to Fern using your existing identity provider.
 
 SSO setup requires working with Fern to exchange configuration values (like callback URLs and entity IDs). To get started, select your identity provider below (Okta, Google Workspace, or Microsoft Entra), then choose SAML or OIDC.