Add information on split direction values

[themkat]

I experienced some minor confusion while making Ghosty splits behave more like Emacs. Example values I ended up with:

keybind = ctrl+x>2=new_split:right
keybind = ctrl+x>3=new_split:down
keybind = super+left=goto_split:left
keybind = super+right=goto_split:right
keybind = super+up=goto_split:top
keybind = super+down=goto_split:bottom

The confusion arose from new_split using up/down while goto_split uses top/bottom. Felt like the docs could benefit from having some example values to avoid this confusion 🙂

Installed via homebrew on an m1 mac today, so should be the latest version. Feel free to reject this PR if not relevant anymore (or if I'm stupid) 🙂

EDIT: Sorry for being stupid. Seems like these are auto-generated from source. The live website is probably not updated after the doc was written.

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[github-actions]

Note: This PR contains modifications to auto-generated sections of the documentation. These are generated from comments in ghostty's source code. Please submit changes to the upstream repository at https://github.com/ghostty-org/ghostty by modifying the appropriate source files