fix the broken link to sample drivers

[kmova]

Minor change to fix the broken link. Changed from https://kubernetes-csi.github.io/docs/Drivers.html to https://kubernetes-csi.github.io/docs/drivers.html

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @kmova. Thanks for your PR.

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[kmova]

Fixed by #158