redirectAfterPost key missing from docs/modules/guides/comments/

[otsolap]

Short description of the enhancement

Let's add redirectAfterPost key to the comments module documentation.

https://processwire.com/docs/modules/guides/comments/

Optional: Steps that explain the enhancement

Comments-module has an key titled redirectAfterPost but it's not mentioned in the module's documentation. I believe it would be an valuable asset to be mentioned.