I see you have an unanswered question but I think it will help if you describe it a little more like where does it say this? I see that it's a talent so it must be for your pet. Have you tried moving your cursor over the picture by the talent it will tell you what that talent does. If you still don't understand I prefer bringing your question into more detail. Maybe you'll get more replies! Megan Stormmask lvl. 47
It probably refers to a bonus added to your outgoing heals, so anything you heal will receive 1% extra added. For example, if you use a +420 fairy card on a friend, that friend will get +424 health instead. If you continue to train that pet, it will become a bigger bonus.