docs: remove some noisy spacing in pre-blocks

These newlines caused the blocks to have trailing newlines in them,
which renders a bit noisily.

Signed-off-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
1 file changed