[WIP] Document DRA partitionable devices

[mortent]

Description

k/k development PR: kubernetes/kubernetes#129140
This is a placeholder

Issue

k/enhancement issue: kubernetes/enhancements#4815
Closes: #

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[sftim]

/retitle [WIP] Document DRA partitionable devices

Don't mention issues or PRs in commit messages (when PRs merge, this triggers a commit)