🌱 Fix markdown format error in MachinePool API proposal

[yf4n]

What this PR does / why we need it:
github throw error Error in user YAML: (<unknown>): did not find expected key while parsing a block mapping at line 1 column 1 when user visit this proposal

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
None

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[yf4n]

/area documentation

[stmcginnis]

/ok-to-test
/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 7d6284e0ec25f625234a85b62f49222b69719957

[sbueringer]

Thx!

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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