Support JSDoc `@function`

<!-- BUGS: Please use this template. --> <!-- QUESTIONS: This is not a general support forum! Ask Qs at http://stackoverflow.com/questions/tagged/typescript --> <!-- SUGGESTIONS: See https://github.com/Microsoft/TypeScript-wiki/blob/master/Writing-Good-Design-Proposals.md --> From: https://github.com/Microsoft/vscode/issues/21321 **TypeScript Version:** 2.2.1 / nightly (2.2.0-dev.201xxxxx) **Code** ```ts // test-module.d.ts declare module 'test-module' { declare function func<T>(c: T): (y: any) => any; } ``` ```js // example.js import { func } from 'test-module'; /** * @function * @param {number} c first number * @returns {number} result */ const thisDoesNot = func(1); ``` **Expected behavior:** The JSDoc specifications give `thisDoesNot` a type of `(c: number) => number` **Actual behavior:** The type from the `*.d.ts` file is preferred instead, giving `thisDoesNot` a type of `(c: any) => any`