Documentation: fix code block and literal block highlighting ...

Use shell script highlighting where it is resonable, use console
highlighting for transcripts, and fix some of the few cases where the
syntax was broken, resulting in text not being rendered at all.

Signed-off-by: Roland Hieber <r.hieber@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Documentation: remove :numbered: from lower level toctrees ...

Only the highest level toctree may have :numbered:, otherwise
sphinxs complains loudly that the subtree is already numbered.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

docs: mvebu: describe -n more accurately in the sphinx document ...

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

docs: move kwboot description to generic mvebu section ...

Expand the generic part about kwboot to the mvebu page and advertise the
parameter -n to make it simpler to boot some machines.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

docs: mvebu can do 2nd stage booting ...

Since commit

	823d08e3e261 ("kwbimage_v1: add support to boot a mvebu image")

barebox can use bootm to load a 2nd barebox image. Update the
documentation accordingly.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: mvebu: document some general mvebu stuff and the rn2120 board ...

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>