kubectl-*: move .yaml inside token syntax (#8856)

pages/common/kubectl-describe.md

@@ -21,4 +21,4 @@
 
 - Show details of Kubernetes objects defined in a YAML manifest:
 
-`kubectl describe -f {{path/to/manifest}}.yaml`
+`kubectl describe -f {{path/to/manifest.yaml}}`

pages/common/kubectl-get.md

@@ -29,4 +29,4 @@
 
 - Get Kubernetes objects defined in a YAML manifest:
 
-`kubectl get -f {{path/to/manifest}}.yaml`
+`kubectl get -f {{path/to/manifest.yaml}}`