Hello, when I tried to add external_links for my co-authors on the projects of my website, I used markdown grammer [example](https://example.com). But I failed and there was already a [] outside all authors, like authors: [[A](https://a.com),B], hugo reported the error: failed to unmarshal YAML: yaml: line 4: did not find expected ‘,’ or ‘]’. So what am I supposed to do If I want to add an external_link like this. Thanks in advance.
Please show your work. We don’t know where you are adding that markup. 