Documentation returned from constant type instead of from the constant itself

<!-- 🚨 STOP 🚨 𝗦𝗧𝗢𝗣 🚨 𝑺𝑻𝑶𝑷 🚨 Half of all issues filed here are duplicates, answered in the FAQ, or not appropriate for the bug tracker. Even if you think you've found a *bug*, please read the FAQ first, especially the Common "Bugs" That Aren't Bugs section! Please help us by doing the following steps before logging an issue: * Search: https://github.com/Microsoft/TypeScript/search?type=Issues * Read the FAQ: https://github.com/Microsoft/TypeScript/wiki/FAQ Please fill in the *entire* template below. --> From https://github.com/microsoft/vscode/issues/89508 <!-- Please try to reproduce the issue with the latest published version. It may have already been fixed. For npm: `typescript@next` This is also the 'Nightly' version in the playground: http://www.typescriptlang.org/play/?ts=Nightly --> **TypeScript Version:** 3.8.0-dev.20200128 <!-- Search terms you tried before logging this (so others can find this issue more easily) --> **Search Terms:** - jsdoc - quickinfo - signatureHelp **Code** For the code: ```ts /** * Interface! */ interface Handler<T> { /** * Call! */ (): void; } /** * Instance! */ declare const catHandler: Handler<string>; catHandler() ``` 1. Hover over `catHandler()` **Expected behavior:** Documentation `Instance!` is returned **Actual behavior:** Documentation for `Call!` returned: <img width="429" alt="Screen Shot 2020-01-28 at 2 47 01 PM" src="https://user-images.githubusercontent.com/12821956/73312221-0ffc6b00-41dd-11ea-93fc-39b212e0afa8.png"> /cc @Tyriar