Update charts/rucio-webui/README.md

Co-authored-by: Riccardo Di Maio <35903974+rdimaio@users.noreply.github.com>

charts/rucio-webui/README.md

@@ -118,7 +118,7 @@ service:
 Furthermore, you can also change the service type depending on how you want to expose the WebUI. For example, to expose the WebUI using a `LoadBalancer` service, you would set the `service.type` parameter to `LoadBalancer`. To expose the WebUI using a `NodePort` service, you would set the `service.type` parameter to `NodePort` and the `service.nodePort` parameter to the desired port.
 
 ## Ingress
-If you want to use and ingress controller to expose the servers you will have to
+If you want to use an ingress controller to expose the servers you will have to
 configure them separately. In this case the service type should stay as 
 `ClusterIP`. A simple ingress for the api server would like this: