[Merge] ~racb/ubuntu-governance-docs:add-dmb-selection-process-policy into ubuntu-governance-docs:main

[Sebastien Bacher]

Ok, I didn't have the needed acl but Marek did it for me, the page is available now on https://canonical-ubuntu-governance-docs.readthedocs-hosted.com/en/latest/policy/dmb-selection-process/
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https://code.launchpad.net/~racb/ubuntu-governance-docs/+git/ubuntu-governance-docs/+merge/487297
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