raspberrypi.md: Fix syntax for DokuWiki
raspberrypi.md: Fix syntax for DokuWiki

The fix is required to properly export the
markdown to dokuwiki using pandoc.

Signed-off-by: Leon Anavi <15d13d7e2c6115f28df053122512bfcb5eb2dbf7@konsulko.com>

automotive-grade-linux/docs-agl,automotive-grade-linux/docs-agl,leon-anavi/docs-agl,claneys/docs-agl,leon-anavi/docs-agl,automotive-grade-linux/docs-agl,claneys/docs-agl,automotive-grade-linux/docs-agl,leon-anavi/docs-agl,claneys/docs-agl,leon-anavi/docs-agl,claneys/docs-agl