FR: Use clickable hyperlinks in `spell_check_*()`

[olivroy]

If cli is installed.

Refhttps://cli.r-lib.org/reference/links.html

I'd be happy to try opening a PR if you think this is of interest.

This would require having cli as Suggests.

Or maybe add an rstudio addins with markers

Thanks

Edit: fixing #54 would also help a lot.