fix yaml indentation in GPU docs
fix yaml indentation in GPU docs

Signed-off-by: Nicolas De Loof <27d8e526c390473e9c51da80626c6b0539b42f4f@gmail.com>

docker/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,docker/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io