Correct MetalLB setup instructions.

[danderson]

MetalLB IPs must not be shared with any other system. That includes DHCP servers and Kubernetes node IPs. IP conflicts result in hard to debug failures, and generally just doesn't work correctly.

What this PR does / why we need it:

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

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[k8s-ci-robot]

Hi @danderson. Thanks for your PR.

I'm waiting for a kubernetes 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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[aledbf]

/ok-to-test
/lgtm

[aledbf]

@danderson thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, danderson

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[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@8fb2695). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master   #4885   +/-   ##
========================================
  Coverage          ?   58.5%           
========================================
  Files             ?      88           
  Lines             ?    6719           
  Branches          ?       0           
========================================
  Hits              ?    3931           
  Misses            ?    2359           
  Partials          ?     429

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[k8s-ci-robot]

@danderson: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-ingress-nginx-e2e-1-15	2fe3e92	link	/test pull-ingress-nginx-e2e-1-15
pull-ingress-nginx-e2e-1-16	2fe3e92	link	/test pull-ingress-nginx-e2e-1-16

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.