Remove shorthand `-k` option from `docker version`

The `-k` shorthand was alreaady removed from other
commands, so best to be consistent.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cli/command/system/version.go

@@ -105,7 +105,7 @@ func NewVersionCommand(dockerCli command.Cli) *cobra.Command {
 
 	flags := cmd.Flags()
 	flags.StringVarP(&opts.format, "format", "f", "", "Format the output using the given Go template")
-	flags.StringVarP(&opts.kubeConfig, "kubeconfig", "k", "", "Kubernetes config file")
+	flags.StringVar(&opts.kubeConfig, "kubeconfig", "", "Kubernetes config file")
 	flags.SetAnnotation("kubeconfig", "kubernetes", nil)
 
 	return cmd

docs/reference/commandline/version.md

@@ -23,7 +23,7 @@ Show the Docker version information
 Options:
   -f, --format string       Format the output using the given Go template
       --help                Print usage
-  -k, --kubeconfig string   Kubernetes config file
+      --kubeconfig string   Kubernetes config file
 ```
 
 ## Description