Update Documentation to Work Properly

The provider.id is used as the backend auth endpoint, which is added in this same guide. The default provider id is `github`, which will point to the wrong auth endpoint. Without modifying the core package code, this guide will not work without this additional configuration line.

Signed-off-by: devonpaluso <55293990+devonpaluso@users.noreply.github.com>

docs/auth/index.md

@@ -371,6 +371,7 @@ createApiFactory({
       configApi,
       discoveryApi,
       oauthRequestApi,
+      provider: { id: 'ghe', title: 'GitHub Enterprise', icon: () => null },
       defaultScopes: ['read:user'],
       environment: configApi.getOptionalString('auth.environment'),
     }),