Small documentation changes to warn users about deploying VPA with leader election on GKE.

[raywainman]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Updates documentation to warn and inform users about how to properly use leader election in GKE when deploying their own VPA recommender.

Which issue(s) this PR fixes:

#7461

[raywainman]

/assign @adrianmoisey

[adrianmoisey]

/lgtm

Thanks for making this PR

[adrianmoisey]

Is it worth also updating https://github.com/kubernetes/autoscaler/tree/master/vertical-pod-autoscaler#known-limitations to be super loud and clear about the issue?

[Shubham82]

@raywainman, please address the following failed test case Tests / test-and-verify (pull_request) , that is required to pass to merge this PR. There is a gofmt issue(under the main.go file), as mentioned you have to run hack/update-gofmt.sh to fix the test case.

[Shubham82]

/lgtm cancel

removing lgtm, as the required test case has failed.

[adrianmoisey]

/lgtm

[Shubham82]

Thanks @raywainman
/lgtm

[raywainman]

Discussed with @kwiesmueller and we agreed I would remove the comment in main.go since we should really try to refrain from putting vendor specific stuff into the code.

[raywainman]

/assign @kwiesmueller

[Shubham82]

/lgtm

[kwiesmueller]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kwiesmueller, raywainman

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