Merge pull request #40912 from mrgiles/40582_kubectl_cheat_sheet_version

Add Kubernetes version information to the kubectl cheat sheet

Author: k8s-ci-robot

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

@@ -15,6 +15,9 @@ card:
 
 This page contains a list of commonly used `kubectl` commands and flags.
 
+{{< note >}}
+These instructions are for Kubernetes v{{< skew currentVersion >}}. To check the version, use the `kubectl version` command.
+{{< /note >}}
 <!-- body -->
 
 ## Kubectl autocomplete
@@ -85,7 +88,7 @@ kubectl config set-context gce --user=cluster-admin --namespace=foo \
 
 kubectl config unset users.foo                       # delete user foo
 
-# short alias to set/show context/namespace (only works for bash and bash-compatible shells, current context to be set before using kn to set namespace) 
+# short alias to set/show context/namespace (only works for bash and bash-compatible shells, current context to be set before using kn to set namespace)
 alias kx='f() { [ "$1" ] && kubectl config use-context $1 || kubectl config current-context ; } ; f'
 alias kn='f() { [ "$1" ] && kubectl config set-context --current --namespace $1 || kubectl config view --minify | grep namespace | cut -d" " -f6 ; } ; f'
 ```