update cheat sheet (#15677)

add sort by capacity

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

@@ -158,6 +158,10 @@ kubectl get services --sort-by=.metadata.name # List Services Sorted by Name
 # List pods Sorted by Restart Count
 kubectl get pods --sort-by='.status.containerStatuses[0].restartCount'
 
+# List pods in test namespace sorted by capacity 
+
+kubectl get pods -n test --sort-by=.spec.capacity.storage  
+
 # Get the version label of all pods with label app=cassandra
 kubectl get pods --selector=app=cassandra -o \
   jsonpath='{.items[*].metadata.labels.version}'