Tiny tweak to `couple`'s docs to help vim's LSP

[tankorsmash]

I've loving Uiua, and it's continually impressive with how fast its evolving, and I'm almost embarrassed to ask for this miniscule change, and I can absolutely live without the tweak being made but...

The following (I think) defines the docs for the language,

https://github.com/uiua-lang/uiua/blob/db4aab798c3112a7613429390a007ac45c1a4ae6/src/primitive/defs.rs#L746

and looks great in the docs

and in VsCode:

But in my editor (coc.nvim via neovim), it looks like a typo:

---

Could we change the line to be

/// By default, arrays with different shapes cannot be [couple]'ed.

to make it more clear in text-only editors?

[tankorsmash]

Thank you!