Because of the new gating system (gate-training-guides-tox-slides), we need to
cleanup all existing RST files.
There is a small rendering problem with Landslide in the Upstream training
and all the Title slides (empty slides with only a Title). The check doesn't
like "empty" slides ("Document or section may not begin with a transition."),
Landslide deals with this by ignoring errors
(https://github.com/adamzap/landslide/issues/94), but our gating check does
not. I temporary changed all such slides to normal ones.
I also had to change training-guides/landslide.sh a bit (a quick hack so that
it works as expected).
Change-Id: I6c3ae06235e69c4a53741e74a5642d27083f4df0
747227bb04