Example/Docs for using kfunc

[ek-nath]

The recently added support for kfunc doesn't have any documentation or examples of how to use it. It'd be nice if there was some examples.

[ti-mo]

Good point, although we do have a testdata case for kfunc that is pretty representative of how it's supposed to be used in the wild, if that helps you to get started. I started writing down what needs to be done docs-wise: #1152. Subscribe to that one if you'd like to stay posted. Closing this topic for now.