Parameter JSDoc could be included in tooltip

[NoelAbrahams]

Hi,

Version: VS 2015 / TS 1.5

When hovering over the property foo, it would be helpful if the JSDoc "The foo option" was also displayed. At present the only way to figure out what the property represents seems to be to delete and type it again:

[mhegazy]

looks like a dupe of #290

[NoelAbrahams]

Yes, I think it's a duplicate.