Document kubecontext showing namepace (spaceship-prompt#566)

docs/Options.md

@@ -463,7 +463,9 @@ Ember.js section is shown only in directories that contain a `ember-cli-build.js
 
 ### Kubectl context (`kubecontext`)
 
-Shows the active kubectl context.
+Shows the active kubectl context, which consists of a cluster name and, when working in a non-default namespace, also a namespace name.
+
+**💡 Tip:**  If your cluster name (and thus context name) is too long, you can give it a shorter name using `kubectl config rename-context very_long_context_name name`.
 
 | Variable | Default | Meaning |
 | :------- | :-----: | ------- |