Documentation: tplink-mr3020: fix 'Could not lex literal_block as "c"' warning
The patch fixes these sphinx warnings:
barebox/Documentation/boards/mips/tplink-mr3020.rst:31: WARNING: Could not lex literal_block as "c". Highlighting skipped.
barebox/Documentation/boards/mips/tplink-mr3020.rst:40: WARNING: Could not lex literal_block as "c". Highlighting skipped.
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>