removed repeated and confusing instruction

[bobmoff]

not sure why this is mentioned here when the first thing in this lab is to install kubectl ?

[derek]

Thank you for your contribution. I've just checked and your commit doesn't appear to be signed-off. That's something we need before your Pull Request can be merged. Please see our contributing guide.
Tip: if you only have one commit so far then run: git commit --amend --signoff and then git push --force.

[alexellis]

Please propose your change in an issue?

[alexellis]

Having a clear-up on GitHub issues / PRs over 1 month old. Let's revisit as necessary. Thank you for the PR.