docs: correct getting-started info about using KeptnConfig (#2326)

Signed-off-by: Meg McRoberts <meg.mcroberts@dynatrace.com>
Co-authored-by: odubajDT <93584209+odubajDT@users.noreply.github.com>

docs/content/en/docs/getting-started/observability/_index.md

@@ -76,12 +76,16 @@ spec:
   keptnAppCreationRequestTimeoutSeconds: 30
 ```
 
-Apply the file and restart Keptn to pick up the new config:
+Apply the file and wait for Keptn to pick up the new configuration:
 
 ```shell
 kubectl apply -f keptnconfig.yaml
 ```
 
+Keptn reacts immediately to a configuration change.
+although the speed depends on the Kubernetes API server signaling updates
+and can be influenced by network latency.
+
 ## Step 2: Create Namespace for Demo Application
 
 Save this file as `namespace.yaml`.