Code highlight message structure typo

[ndr-brt]

On the wiki it's reported that:
< /code/highlight <duration> <cycle position> <row> <col> <row> <col>

but the reality is:
< /code/highlight <duration> <cycle position> <col> <row> <col> <row>

In addition, row numbers start from 1 not from 0 as column numbers

[yaxu]

What do you think makes most sense - to match with x y ?

[yaxu]

Note also this idea: #9

Designed to make it easier to implement highlighting that works even as code is edited, as individual characters can be associated with the original tokens as they are highlighted.

[ndr-brt]

The best would be to match x y and make them starts from zero.