update wmii/columns docs for people who are migrating
update wmii/columns docs for people who are migrating

per https://github.com/qtile/qtile-examples/commit/76e7d48658ac3c5261388cf0a7d5e657c5d1805b

Signed-off-by: Tycho Andersen <6b523322678240882acbb4da5312a12d8cd0082d@tycho.ws>

ramnes/qtile,qtile/qtile,tych0/qtile,zordsdavini/qtile,soulchainer/qtile,ramnes/qtile,tych0/qtile,zordsdavini/qtile,qtile/qtile,soulchainer/qtile