aws: add new vCPU limit to docs

[sapkra]

AWS recently changed the instance limit to a vCPU limit

Fixes #2736

[openshift-ci-robot]

Hi @sapkra. Thanks for your PR.

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[sapkra]

/assign @sdodson

[sdodson]

/cc @kalexand-rh

[sdodson]

/lgtm

BTW, according to this article AWS switched to vCPU limits for all accounts on October 24th, so it seems correct to replace instance limit documentation with vCPU limits across the board.

[abhinavdahiya]

/retest

[sapkra]

I rebased the branch on the current master.

[sdodson]

Unless there's a conflict there's generally no need to rebase.
/lgtm
/approve

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sdodson

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[openshift-ci-robot]

@sapkra: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/prow/e2e-aws-scaleup-rhel7	73026e5	link	/test e2e-aws-scaleup-rhel7

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.

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[sdodson]

/override ci/prow/e2e-aws-scaleup-rhel7
/override ci/prow/e2e-aws-upgrade

[openshift-ci-robot]

@sdodson: Overrode contexts on behalf of sdodson: ci/prow/e2e-aws-scaleup-rhel7, ci/prow/e2e-aws-upgrade

In response to this:

/override ci/prow/e2e-aws-scaleup-rhel7
/override ci/prow/e2e-aws-upgrade

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.