Missing documentation coverage: CallJsFunction

[namrog84]

There is example documentation showing EmitJsEvent, but there is also the public API for CallJSFunction. It'd be great to have a simple example in the example app or whatever somewhere.

Just something to point to people who want to use CallJsFunction as a valid thing, and expected parameters (basically just add 'emit')

[chrisglein]

Sounds like we have API documentation, but not usage documentation. Clarification could be had around EmitJsEvent (tied to a JS event emitter) and DispatchEvent (tired to a View) and 'CallJsFunction' (lower level function call)

[chrisglein]

Also worth answering what exists in core and what documentation exists there.