To Alex F.
Thank you. I appreciate you pointing out that there is a keychain app which I was unaware of and that passwords are stored in settings. I don't use a password managing app. I search for info on iphone keychain and passwords saved on my phone and found it in settings. I was unaware it was there. I think I've figured it out and can now change passwords that Apple recommended were at risk.
Not sure about canceling it out. It only shows on the screen of my iphone under the heading "Notification Center". When I held my finger on it it shows the whole message. I would have had no way of knowing it was legit and from Apple. Seems like a dumb way to let people know there is a problem. I'm still not sure it is from Apple. Why didn't Apple just send an email? I guess it will go away when I click on the clear button on the screen for all the notifications.
Also I have never received one of these notifications before. So would that mean the data leak just happened and that's why I'm being notified?
Thank you for replying and for the information you provided.