If you want to upload an app or a new version of an app to the Google Play console, a description of this version is required. According to Google, this description should cover the following:
Let your users know about recent updates you’ve made in this release of your app. Your “What’s new” description shouldn’t be used for promotional purposes or to solicit actions from your users.
For instance, write about new features, new enhancements, or give information about fixed bugs.