Fix needed on Help page

I like the [help page on setting up two-factor login security using an authenticator app](https://support.ring.com/hc/en-us/articles/360061508852-How-to-Download-and-Use-an-Authenticator-App-) (as I previously faulted Ring for not offering this highest login security option). However, it would be even better if the [link to search for authenticator apps on the iOS App Store](https://www.apple.com/us/search/authticator?src=globalnav) used a properly-spelled search string. :wink: