Git: Multirepo patch set

In the context of Alejandro Colomar stepping down as a man-pages maintainer :(, I learned from him that&#xA;it is possible with git to create an email patch set that spans multiple target repositories.&#xA;Specifically, he pointed to a review thread by Jiri Olsa where this was done, and whose outline takes a similar shape to this (simplified): &#xA; &#xA; [PATCH proj v3 0/3] foobar: Add…