You comment would have been more well-received if you explained the issue, rather than just linking a page that doesn't. Anyway, it's "could/should/would have"

You comment would have been more well-received if you explained the issue, rather than just linking a page that doesn't. Anyway, it's "could/should/would have" which in its contracted form is "could've" / "should've" / "would've". If you were going to only include a link, https://en.oxforddictionaries.com/usage/could-of-or-could-have https://en.oxforddictionaries.com/usage/could-of-or-could-ha... would have been a better choice, for example.