Mention the debian-backports option in the instructions for Raspbian (armhf)
We have instructions for getting Tor on Raspbian (armhf) that mention most prominently compiling Tor from source and then, as an alternative, using the Debian package (given that we currently do not ship Tor for armhf in our own Debian repository.
It seems there are lots of folks running relays and bridges stuck on armhf Raspbian with unsupported Tor versions in their Debian repositories which they are tracking and it's hard for them to compile Tor from source. It turns out that Debian backports is working pretty well in many of those cases. We should therefore mention that option in our documentation as well.