fix wrong comment when spliting window

[Ainevsia]

opposite comment: vertically and horizontally

[gpakosz]

Hello @Ainevsia 👋

I don't think there's a mistake here.

"split horizontally" conveys a left/right relationship, and for that you need the split to be vertical: tmux split-window -v.

"split vertically" conveys a top/bottom relationship, and for that you need the split to be horiziontal: tmux split-window -h.

[Ainevsia]

Oh, very sorry for this interrupt. I used to think that I can get two horizontally left-right panes after splitting horizontally, and I didn't realize that what the comment described is the way to split the current window. I think maybe -v should be used with vertical and maybe there is a typo. Apologize again

[gpakosz]

No problem