Follow inheritdoc

Functions with `inheritdoc` should give the inherited documentation on mouseover etc. For example:

```f#
open System.Reactive.Linq

///
let throttle (period:TimeSpan) source =
Observable.Throttle (source, period)
```

When hovering over the function name, no documentation it shown. It does, however, show a lot of empty space (see image) that's not present if I remove the doc comment altogether.