Adding a tool tip page to a button or image

Hello,

I was watching a video yesterday and during it I noticed that on a report that was being showcased, the information button had been used and when it was hovered over, it had a whole lot of text that appeared to be coming from a tool tip page or similar. I’d like to be able to do this rather than sending a user away to another page to read FAQs but upon going into Power BI today, it doesn’t seem as if you can link a tool tip page to a button. Is someone able to explain how I can do this please?

I’ve attached a screen shot from the video to help show what I am wanting to do

Thanks!