Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

When splitting `snake_case` words, omit the underscore

While we require camelCase by convention for official APIs, CRDs may use
`snake_case`, and the generic describer prints this as `Snake _ Case`.  We should print `Snake Case`

Prow is impacted by this for the ProwJob CRD:

```
  Decoration _ Config:
    Gcs _ Configuration:
      Bucket:                    origin-ci-test
      Default _ Org:             openshift
      Default _ Repo:            origin
      Path _ Strategy:           single
    Gcs _ Credentials _ Secret:  gcs-publisher-credentials
```

@kubernetes/sig-cli-pr-reviews

```release-note
Using `kubectl describe` on CRDs that use underscores will be prettier.
```