Fix a few things in docs

source/docs/v3/optional-features.md

@@ -0,0 +1,18 @@
+---
+title: Optional features
+extends: _layouts.documentation
+section: content
+---
+
+# Optional features
+
+"Features" are classes that provide additional functionality that's not needed for the core tenancy logic. Out of the box, the package comes with these Features:
+
+- [`UserImpersonation`]({{ $page->link('features/user-impersonation') }}) for generating impersonation tokens for users of a tenant's DB from other contexts
+- [`TelescopeTags`]({{ $page->link('features/telescope-tags') }}) for adding tags with the current tenant id to Telescope entries
+- [`TenantConfig`]({{ $page->link('features/tenant-config') }}) for mapping keys from the tenant storage into the application config
+- [`CrossDomainRedirect`]({{ $page->link('features/cross-domain-redirect') }}) for adding a `domain()` macro on `RedirectResponse` letting you change the intended hostname of the generated route
+- [`UniversalRoutes`]({{ $page->link('features/universal-routes') }}) for route actions that work in both the central & tenant context
+All of the package's Features are in the `Stancl\Tenancy\Features` namespace.
+
+You may register features by adding their class names to the `tenancy.features` config.