[Bug] Methods returned in object by function improperly indented when using 'return'

* **Input code:** [`KaKi87/puppeteer-helpers/mod.js`](https://git.kaki87.net/KaKi87/puppeteer-helpers/src/branch/master/mod.js)
* **Output documentation:** [`KaKi87/puppeteer-helpers/DOCUMENTATION.md`](https://git.kaki87.net/KaKi87/puppeteer-helpers/src/branch/master/DOCUMENTATION.md)
* **Expected:** methods returned by [`page.js`](https://git.kaki87.net/KaKi87/puppeteer-helpers/src/branch/master/src/page.js) & [`userPreferences.js`](https://git.kaki87.net/KaKi87/puppeteer-helpers/src/branch/master/src/userPreferences.js)'s exported functions are correctly indented like methods returned by [`browser.js`](https://git.kaki87.net/KaKi87/puppeteer-helpers/src/branch/master/src/browser.js)'s exported function
* **Actual:** the formers aren't (using `=> return {}`) while the latter is (using `=> ({})`)
* **What version of documentation.js are you using?:** [`13.2.5`](https://www.npmjs.com/package/documentation/v/13.2.5)
* **How are you running documentation.js (on the CLI, Node.js API, Grunt, other?):** CLI

Thanks