[KEP-5004] DRA Extended resource documentation

[mortent]

Description

Documentation for the DRA Extended resource feature

Issue

kubernetes/enhancements#5004

Closes: #

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[yliaog]

closing this PR, it has been replaced by #51710

/close

[k8s-ci-robot]

@yliaog: Closed this PR.

In response to this:

closing this PR, it has been replaced by #51710

/close

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