Doc singleInstance activities and browser-switch (#13)
Doc singleInstance activities and browser-switch (#13)

Issue reported here: https://github.com/braintree/braintree_android/issues/236

Activities that have a `singleInstance` launch mode (i.e. Activity launching on its own activity stack) will start Activities on a different activity stack which prevents Browser Switch from returning a result.
braintree/browser-switch-android,braintree/browser-switch-android,braintree/browser-switch-android