New rule for mistaken image/link: `()[]`

[wooorm]

Initial checklist

• [X] I read the support docs
• [X] I read the contributing guide
• [X] I agree to follow the code of conduct
• [X] I searched issues and couldn’t find anything (or linked relevant results below)

Problem

I’ve heard that markdown users often get the parens/brackets wrong.

Solution

a lint rule :)

Alternatives

[remcohaszing]

Absolutely :+1: I fell for this myself a lot in the past.