Typo fix for JS course in JSDoc

Just a small JSDoc typo

PR Link: https://github.com/exercism/javascript/pull/2366

As much as I understand JSDoc, the visitor you removed is the parameter name and the only required part of it. See @param JSDoc. It could use a - to make a better separation between name and description. But that is optional.

Oh, I see what you mean. I’m not gonna add the - cause that’s a pretty insignificant change