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: Change many code blocks to no highlight ...

Several blocks cannot be sensibly highlighted, so change the highliting
to 'none'. Fixes many warnings in building the documentation.

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

Documentation: add OpenRISC or1ksim emulator section ...

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Cc: Franck Jullien <franck.jullien@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>