docs: improve Orphaned Resources Monitoring with more examples and co…

…rrect grammar (#6006)

Signed-off-by: Ryota <rytswd@gmail.com>

docs/user-guide/orphaned-resources.md

@@ -1,14 +1,36 @@
 # Orphaned Resources Monitoring
 
 Orphaned Kubernetes resource is a top-level namespaced resource which does not belong to any Argo CD Application. The Orphaned Resources Monitoring feature allows detecting
-orphaned resources, generate a warning and inspect/remove resources using Argo CD UI.
+orphaned resources, inspect/remove resources using Argo CD UI and generate a warning.
 
-The Orphaned Resources monitoring is enabled in [Project](projects.md) settings. Once the feature is enabled each project application which target namespace has orphaned resource
-will get a warning condition. The orphaned resources can be located using the application details page:
+The Orphaned Resources monitoring is enabled in [Project](projects.md) settings, 
+and the below is an example of enabling the feature using the AppProject custom resource.
+
+```yaml
+kind: AppProject
+metadata:
+  ...
+spec:
+  ...
+  orphanedResources:
+    warn: true
+...
+```
+
+Once the feature is enabled, each project application which has any orphaned resources in its target namespace
+will get a warning. The orphaned resources can be located using the application details page:
 
 ![orphaned resources](../assets/orphaned-resources.png)
 
-Before enabling feature you might consider disabling warning. In this case application users are going to see orphaned resources in the UI but application is won't get a warning condition.
+When enabling the feature, you might want to consider disabling warning at first.
+
+```yaml
+spec:
+  orphanedResources:
+    warn: false # Disable warning
+```
+
+While warning disabled, application users can still view orphaned resources in the UI.
 
 ## Exceptions
 
@@ -18,3 +40,13 @@ Not every resource in the Kubernetes cluster is controlled by the end user. Foll
 * `ServiceAccount` with name `default` ( and corresponding auto-generated `ServiceAccountToken` ).
 * `Service` with name `kubernetes` in the `default` namespace.
 * `ConfigMap` with name `kube-root-ca.crt` in all namespaces.
+
+Also, you can configure to ignore resources by providing a list of resource Group, Kind and Name.
+
+```yaml
+spec:
+  orphanedResources:
+    ignore:
+    - kind: ConfigMap
+      name: orphaned-but-ignored-configmap
+```