add log commands with label flag (#13804)

* add log commands with label flag

* style

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

@@ -271,11 +271,14 @@ kubectl -n my-ns delete po,svc --all                                      # Dele
 
 ```bash
 kubectl logs my-pod                                 # dump pod logs (stdout)
+kubectl logs -l name=myLabel                        # dump pod logs, with label name=myLabel (stdout)
 kubectl logs my-pod --previous                      # dump pod logs (stdout) for a previous instantiation of a container
 kubectl logs my-pod -c my-container                 # dump pod container logs (stdout, multi-container case)
+kubectl logs -l name=myLabel -c my-container        # dump pod logs, with label name=myLabel (stdout)
 kubectl logs my-pod -c my-container --previous      # dump pod container logs (stdout, multi-container case) for a previous instantiation of a container
 kubectl logs -f my-pod                              # stream pod logs (stdout)
 kubectl logs -f my-pod -c my-container              # stream pod container logs (stdout, multi-container case)
+kubectl logs -f -l name=myLabel --all-containers    # stream all pods logs with label name=myLabel (stdout)
 kubectl run -i --tty busybox --image=busybox -- sh  # Run pod as interactive shell
 kubectl attach my-pod -i                            # Attach to Running Container
 kubectl port-forward my-pod 5000:6000               # Listen on port 5000 on the local machine and forward to port 6000 on my-pod