Fix broken link in README

[jenspinney]

I noticed the link to the docs site from the README is broken. This PR updates the link to what I believe it should be pointing to.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[fejta-bot]

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Mark the issue as fresh with /remove-lifecycle stale.
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[brancz]

You need to sign the CLA, otherwise this lgtm :)

[brancz]

Ah turns out this was already fixed by #236.

Thanks for the effort! :)

/close

[k8s-ci-robot]

@brancz: Closed this PR.

In response to this:

Ah turns out this was already fixed by #236.

Thanks for the effort! :)

/close

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