404 when changing from old docs to 2.6 or devel

[d0ugal]

If you go to the old docs, for example; https://old-docs.maas.io/2.1/en/

Then select either 2.6 or devel in the version drop down on the top left you will end up at a 404; https://maas.io/docs/docs - Note the extra "/docs"

It also seems odd that both 2.6 and devel go to the same location, since the documentation is for 2.7 and not 2.6 or devel.