Update app-links.md

[ahoffmandevelopment]

The activity.Finish(); line causes the app to behave incorrectly when opening it from a deep link.

The app won't "crash" in the traditional sense, but does immediately go into the background. Opening the app switcher and choosing the app again just repeats the behavior.

Removing the call corrects the behavior.

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docs/android/app-links.md	Android app links

[ahoffmandevelopment]

Resolves #2213

[davidbritch]

Fixes #2212