📖 Fix link 404 in 20190610-machine-states-preboot-bootstrapping.md

[chymy]

What this PR does / why we need it:
Fix link 404 in 20190610-machine-states-preboot-bootstrapping.md

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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[k8s-ci-robot]

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[vincepri]

/ok-to-test

[vincepri]

/milestone v0.4.0
/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vincepri

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