Fixed incrementBoard - Thanks Darknico for reporting the issue

Signed-off-by: emanuele <emanuele45@gmail.com>
Fixed decrementBoard as well

Signed-off-by: emanuele <emanuele45@gmail.com>
Fixed doc

Signed-off-by: emanuele <emanuele45@gmail.com>
Merge pull request #898 from emanuele45/quick_fix

Fixed incrementBoard - Thanks Darknico for reporting the issue