Visual Studio 2015 no documentation tooltip
<p>Weirdly enough, the tooltip documentation on my Visual Studio 2015 Community Edition when using Xamarin 6.1.1 (and I think the previous version as well) doesn't appear correctly. They all written as "To be added", even on the common C# method like <code>int.TryParse()</code>.</p>

<p>If I'm working different project other than Xamarin (such as a console app project), there's even no "To be added" tooltip. Just blank.</p>

<p>I reckon there's such tooltip help, that for example, explaining briefly of the method usage. I don't know why it's gone, maybe accidentally pressed something.</p>

<p>Is there any way to show it / maybe I need to download it first?</p>

<p><a href="https://i.stack.imgur.com/okfb3.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/okfb3.jpg" alt="enter image description here"></a></p>