📖 Fix broken link to in-place update proposal

[vidarno]

What this PR does / why we need it:

The link to the in-place update proposal is broken, in the article describing the control-plane contracts, this fixes it.

/area documentation

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: vidarno / name: Vidar Normann (4ed3986)

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[sivchari]

Nice, but please check CLA and CI.