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kubectl: make error with resource list prettier

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

Previously, running commands like `kubectl get` with no further
arguments would print a list of valid resource types with an error
messages formatted like so:

    <snip>
      * serviceaccounts (aka 'sa')
      * services (aka 'svc')
      * statefulsets (aka 'sts')
      * storageclasses (aka 'sc')error: Required resource not specified.
    Use "kubectl explain <resource>" for a detailed description of that resource (e.g. kubectl explain pods).
    See 'kubectl get -h' for help and examples.

This commit adds extra spacing so it now looks pretty:

    <snip>
      * serviceaccounts (aka 'sa')
      * services (aka 'svc')
      * statefulsets (aka 'sts')
      * storageclasses (aka 'sc')

    error: Required resource not specified.
    Use "kubectl explain <resource>" for a detailed description of that resource (e.g. kubectl explain pods).
    See 'kubectl get -h' for help and examples.





**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```