Merge pull request #41530 from bruceauyeung/k8s-branch-do-not-use-underscores-in-go-variable-names

Automatic merge from submit-queue

rename variables to make sure that they conform to golang variable name conventions

rename variables to make sure that they conform to golang variable name conventions

**What this PR does / why we need it**:

there are lots of package level unexported variables in package `cmd` not conforming golang variable name conventions, such as `version_example`, in this PR i rename all of them to make sure that they conform to golang variable name conventions

pkg/kubectl/cmd/apply.go

@@ -72,7 +72,7 @@ const (
 )
 
 var (
-	apply_long = templates.LongDesc(i18n.T(`
+	applyLong = templates.LongDesc(i18n.T(`
 		Apply a configuration to a resource by filename or stdin.
 		The resource name must be specified. This resource will be created if it doesn't exist yet.
 		To use 'apply', always create the resource initially with either 'apply' or 'create --save-config'.
@@ -81,7 +81,7 @@ var (
 
 		Alpha Disclaimer: the --prune functionality is not yet complete. Do not use unless you are aware of what the current state is. See https://issues.k8s.io/34274.`))
 
-	apply_example = templates.Examples(i18n.T(`
+	applyExample = templates.Examples(i18n.T(`
 		# Apply the configuration in pod.json to a pod.
 		kubectl apply -f ./pod.json
 
@@ -102,8 +102,8 @@ func NewCmdApply(f cmdutil.Factory, out, errOut io.Writer) *cobra.Command {
 	cmd := &cobra.Command{
 		Use:     "apply -f FILENAME",
 		Short:   i18n.T("Apply a configuration to a resource by filename or stdin"),
-		Long:    apply_long,
-		Example: apply_example,
+		Long:    applyLong,
+		Example: applyExample,
 		Run: func(cmd *cobra.Command, args []string) {
 			cmdutil.CheckErr(validateArgs(cmd, args))
 			cmdutil.CheckErr(validatePruneAll(options.Prune, cmdutil.GetFlagBool(cmd, "all"), options.Selector))