No information on new commands

- I just found out from the small comment below, that there was a `follow` command and has been for some unknown amount of time. > - If you want to access a symlink, why not use the `follow` command directly? _Originally posted by @sxyazi in [#3519](https://github.com/sxyazi/yazi/issues/3519#issuecomment-3715909193)_ - There is **no reference** to this command in the documentation, which itself answers the _"why not?"_ part. - This makes me think there might be **other undocumented commands** which hardly anyone is aware of. - So I would like to suggest **updating the keymap documentation** for any new or undocumented commands :)