Update link to azure cluster-api cloud provider

[tariq1890]

Minor documentation update.

[k8s-ci-robot]

Hi @tariq1890. Thanks for your PR.

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[detiber]

/ok-to-test
/lgtm

[vincepri]

/assign @roberthbailey @justinsb

[roberthbailey]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: roberthbailey, tariq1890

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