📖 feat(docs): update envtest docs

[rumstead]

Description

The controller runtime allows us to check out the binary assets to an explicit location instead of specific locations on each OS. Updating the envtest docs to specify the new binary location defined in the Makefile.

Closes #2389

[k8s-ci-robot]

Hi @rumstead. 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.

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[camilamacedo86]

/ok-to-test

It shows great for me 🥇
So,

/approved

Let's also ask others to give a look and review this one.
Thank you for your contribution.

[varshaprasad96]

Thanks for the PR @rumstead !

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: camilamacedo86, rumstead, varshaprasad96

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[camilamacedo86]

/lgtm