Fix dead links at crs_reference.md

[tuminoid]

| FILE: ./crs_reference.md
| [✖] https://github.com/metal3-io/metal3-dev-env/tree/master/crs
| 
| 3 links checked.
| 
| ERROR: 1 dead links found!
| [✖] https://github.com/metal3-io/metal3-dev-env/tree/master/crs → Status: 404

/triage accepted /help /good-first-issue

Split from https://github.com/metal3-io/metal3-docs/issues/328

[metal3-io-bot]

@tuminoid: This request has been marked as suitable for new contributors.

Please ensure the request meets the requirements listed here.

If this request no longer meets these requirements, the label can be removed by commenting with the /remove-good-first-issue command.

In response to [this](https://github.com/metal3-io/metal3-docs/issues/446): >``` >| FILE: ./crs_reference.md >| [✖] https://github.com/metal3-io/metal3-dev-env/tree/master/crs >| >| 3 links checked. >| >| ERROR: 1 dead links found! >| [✖] https://github.com/metal3-io/metal3-dev-env/tree/master/crs → Status: 404 >``` > >/triage accepted >/help >/good-first-issue > >Split from https://github.com/metal3-io/metal3-docs/issues/328 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[chibuikeIg]

Hi @tuminoid, can I be assigned this issue? I found a working link to the broken link https://github.com/metal3-io/metal3-dev-env/tree/b5a53ecf9576c6deab81f692733782d4c5e8091a/crs

[tuminoid]

Sure!

/assign @chibuikeIg

[chibuikeIg]

Thank you! Will get it done shortly.