CFE-500: Updates spec annotation in nodeobservability.yaml file

Author: darshan-nagaraj

modules/node-observability-create-custom-resource.adoc

@@ -10,10 +10,10 @@ Before you run profiling queries, you must create a `NodeObservability` custom r
 
 [IMPORTANT]
 ====
-Creating a `NodeObservability` CR reboots all the worker nodes. It might take 10 or more minutes to complete.
+The worker nodes matching the `nodeSelector` specified in `NodeObservability` CR are rebooted. It might take 10 or more minutes to complete.
 ====
 
-When you apply the `NodeObservability` CR, it creates the necessary machine config and machine config pool CRs to enable the CRI-O profiling on the worker nodes.
+When you apply the `NodeObservability` CR, the necessary machine config and machine config pool CRs are created to enable the CRI-O profiling on the worker nodes matching the `nodeSelector`.
 
 [NOTE]
 ====
@@ -52,11 +52,12 @@ $ oc project node-observability-operator
     metadata:
       name: cluster <1>
     spec:
-      labels:
-        node-role.kubernetes.io/worker: ""
+      nodeSelector:
+        node-role.kubernetes.io/worker: "" <2>
       type: crio-kubelet
 ----
 <1> You must specify the name as `cluster` because there should be only one `NodeObservability` CR per cluster.
+<2> Specify the nodes on which the Node Observability agent must be deployed.
 
 . Run the `NodeObservability` CR:
 +