Update install.md

[streamnsight]

Update the repo install with Helm

fix #2869

This PR is a

• [ ] Feature Implementation
• [ ] Bug Fix
• [X] Documentation

What this PR does / why we need it:

Which issue(s) this PR fixes

Fixes #

Please leave this checklist in the PR comment so that maintainers can ensure a good PR.

Merge Checklist:

• [ ] New feature
  • [ ] Tests
  • [ ] Documentation
• [ ] SVCat CLI flag
• [ ] Server Flag for config
  • [ ] Chart changes
  • [ ] removing a flag by marking deprecated and hiding to avoid breaking the chart release and existing clients who provide a flag that will get an error when they try to update

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[k8s-ci-robot]

Welcome @streamnsight!

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: streamnsight To complete the pull request process, please assign mhbauer after the PR has been reviewed. You can assign the PR to them by writing /assign @mhbauer in a comment when ready.

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Needs approval from an approver in each of these files: - **[OWNERS](https://github.com/kubernetes-sigs/service-catalog/blob/master/OWNERS)** Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[k8s-ci-robot]

Hi @streamnsight. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

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.

[streamnsight]

I signed the CLA, so not sure why it is not updating.

[jhvhs]

Thank you for your contribution, @streamnsight! This issue has been addressed in #2874