How do I fix or correct the "Default File Template" warning in IntelliJ Idea

The point of it is to remind you to document your code by adding a description of the class. No matter what you set the template to, if you don't change the text that is in the template, it assumes you want a reminder to override it with some useful information. If you are not in the habit of adorning your code with informative comments, then you can disable that particular check.

To disable the check, where you see the comment block highlighted as a warning, click in that shaded area, wait for the "light bulb" intention icon to appear near the left margin, then, when it pops up a box that says "Edit template...", instead of clicking on the words, click on the little arrow to the right of the words, and select "Disable inspection".

Just add a new line after Default Template statement which has name and date. Intellij considers that new line as part of documentation, and then stops complaining.
Update

Like this:

/**
 * Created by YourName on 2017/06/11.
 * THIS LINE
 */