(fix) Removed -n test from kubectl get pv command (#18877)

- PV are cluster scoped rather than namespaced scope
    - So, there is no need to list it by namespace

Signed-off-by: Aman Gupta <aman.gupta@mayadata.io>

content/en/docs/reference/kubectl/cheatsheet.md

@@ -160,8 +160,8 @@ kubectl get services --sort-by=.metadata.name
 # List pods Sorted by Restart Count
 kubectl get pods --sort-by='.status.containerStatuses[0].restartCount'
 
-# List PersistentVolumes in test namespace sorted by capacity
-kubectl get pv -n test --sort-by=.spec.capacity.storage
+# List PersistentVolumes sorted by capacity
+kubectl get pv --sort-by=.spec.capacity.storage
 
 # Get the version label of all pods with label app=cassandra
 kubectl get pods --selector=app=cassandra -o \