Update README.md: fix official doc link

[whyvez]

The official documentation link was broken and this commit fixes it.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[brancz]

This looks good, but to merge you will need to sign the CLA.

/check-cla

[der-eismann]

Duplicate of #236.

[fejta-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
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If this issue is safe to close now please do so with /close.

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/lifecycle stale

[fejta-bot]

Stale issues rot after 30d of inactivity.
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/lifecycle rotten

[pierluigilenoci]

/assign @brancz

[brancz]

There is unfortunately nothing much I can do if the CLA is not signed or if the system is not recognizing it. If you signed it but it doesn't seem to work, try contacting a Kubernetes contrib-ex member on the Kubernetes slack.

/check-cla

[pierluigilenoci]

@whyvez could you please sign the CLA?

[fejta-bot]

Rotten issues close after 30d of inactivity.
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/close

[k8s-ci-robot]

@fejta-bot: Closed this PR.

In response to this:

Rotten issues close after 30d of inactivity.
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Mark the issue as fresh with /remove-lifecycle rotten.

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[pierluigilenoci]

/remove-lifecycle rotten