docs: language fix

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

docs/frontend-system/architecture/07-routes.md

@@ -278,7 +278,7 @@ Another thing to note is that this indirection in the routing is particularly us
 
 It is possible to define a default target for an external route reference, potentially removing the need to bind the route in the app. This reduces the need for configuration when installing new plugins through providing a sensible default. It is of course still possible to override the route binding in the app.
 
-The default target uses the same syntax as the route binding configuration, and will only be used if the target plugin an route exists. For example, this is how the catalog can define a default target for the create component external route in a way that removes the need for the binding in the previous example:
+The default target uses the same syntax as the route binding configuration, and will only be used if the target plugin and route exist. For example, this is how the catalog can define a default target for the create component external route in a way that removes the need for the binding in the previous example:
 
 ```tsx title="plugins/catalog/src/routes.ts"
 import { createExternalRouteRef } from '@backstage/frontend-plugin-api';