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

[Sebastien Bacher]

(as a FYI I got an email from launchpad stating 

> Launchpad encountered an internal error during the following operation: emailing a code review comment.  It was logged with id OOPS-a9737b3c629fe50faf83cf774914f46c.  Sorry for the inconvenience.

so you might not have received an email for my review)
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