add object initialisers (property set and init) to suggestions to user in intellisense/doc

[jkone27]

for example in iodide, fsautocomplete we get

linked issue here with details: https://github.com/fsharp/FsAutoComplete/issues/1224

[vzarytovskii]

They will need to be added to any method which returns "this" object as well.

[ijklam]

almost every method...