Fixed doc style in mapwalk.simba

Not sure if RoadColors needs to be there, but meh. Also didn't add an
example for RoadColors, as it seems unnecessary.
fixed an out of range error

doesn't throw an out of range error if the user hasn't declared(or none active) players.
Merge pull request #153 from iluffsyeww/master

Fixed doc style in mapwalk.simba
Merge pull request #154 from Ollybest/patch-5

fixed an out of range error