View events `on-drawing` and `on-ime` and `on-scroll` are undocumented

[hiiamboris]

Also https://doc.red-lang.org/en/view.html#_event_names should contain on-detect mentioned in other parts

[qtxie]

on-drawing and on-ime and on-scroll are experimental.

[greggirwin]

We don't want to spend time doc'ing experimental features, but maybe just "Experimental" as a note in docs would help.