Add examples for CLI ref --api-spec and --server for env set

Signed-off-by: GuessWhoSamFoo <sfoohei@gmail.com>

docs/cli-reference/ks_env_set.md

@@ -25,9 +25,16 @@ ks env set <env-name> [flags]
 ### Examples
 
 ```
-#Update the name of the environment 'us-west/staging'.
+# Update the name of the environment 'us-west/staging'.
 # Updating the name will update the directory structure in 'environments/'.
 ks env set us-west/staging --name=us-east/staging
+
+# Setting k8s API version for an environment
+ks env set us-west/staging --api-spec=version:v1.8.0
+
+# Updating the server
+ks env set us-west/staging --server=https://192.168.99.100:8443
+
 ```
 
 ### Options

pkg/clicmd/env_set.go

@@ -45,9 +45,16 @@ directory structure in ` + "`environments/`" + `.
 
 ### Syntax
 `
-	envSetExample = `#Update the name of the environment 'us-west/staging'.
+	envSetExample = `# Update the name of the environment 'us-west/staging'.
 # Updating the name will update the directory structure in 'environments/'.
-ks env set us-west/staging --name=us-east/staging`
+ks env set us-west/staging --name=us-east/staging
+
+# Setting k8s API version for an environment
+ks env set us-west/staging --api-spec=version:v1.8.0
+
+# Updating the server
+ks env set us-west/staging --server=https://192.168.99.100:8443
+`
 )
 
 func newEnvSetCmd(a app.App) *cobra.Command {