Update observability resources to use gateway-system namespace

Signed-off-by: David Martin <davmarti@redhat.com>

config/observability/openshift/telemetry.yaml

@@ -2,7 +2,7 @@ apiVersion: telemetry.istio.io/v1alpha1
 kind: Telemetry
 metadata:
   name: namespace-metrics
-  namespace: istio-system
+  namespace: gateway-system
 spec:
   metrics:
   - providers:

config/observability/prometheus/monitors/istio/service-monitor-istiod.yaml

@@ -2,11 +2,11 @@ apiVersion: monitoring.coreos.com/v1
 kind: ServiceMonitor
 metadata:
   name: istiod
-  namespace: istio-system
+  namespace: gateway-system
 spec:
   namespaceSelector:
     matchNames:
-    - istio-system
+    - gateway-system
   selector:
     matchLabels:
       app: istiod

doc/install/install-openshift.md

@@ -183,7 +183,7 @@ To scrape these additional metrics, you can install a `kube-state-metrics` insta
 
 ```bash
 kubectl apply -f https://raw.githubusercontent.com/Kuadrant/kuadrant-operator/main/config/observability/openshift/kube-state-metrics.yaml
-kubectl apply -k https://github.com/Kuadrant/gateway-api-state-metrics?ref=main
+kubectl apply -k https://github.com/Kuadrant/gateway-api-state-metrics/config/kuadrant?ref=0.5.0
 ```
 
 To enable request metrics in Istio and scrape them, create the following resource:
@@ -205,6 +205,7 @@ kubectl apply -f https://raw.githubusercontent.com/Kuadrant/kuadrant-operator/ma
 You can configure scraping of metrics from the various Kuadrant operators with the below resources.
 
 ```bash
+kubectl create ns kuadrant-system
 kubectl apply -f https://raw.githubusercontent.com/Kuadrant/kuadrant-operator/refs/heads/main/config/observability/prometheus/monitors/operators.yaml
 ```
 
@@ -225,7 +226,8 @@ For Grafana installation details, see [installing Grafana on OpenShift](https://
 
 ### Step 7 - Setup the catalogsource
 
-Before installing the Kuadrant Operator, you must enter the following commands to set up secrets that you will use later:
+Before installing the Kuadrant Operator, you must enter the following commands to set up secrets that you will use later.
+If you haven't aleady created the `kuadrant-system` namespace during the optional observability setup, do that first:
 
 ```bash
 kubectl create ns kuadrant-system