Updates to Android Setup Documentation

[stevecarlton]

Just went through the Android setup documentation for this plugin, located here: https://help.branch.io/developers-hub/docs/capacitor

I noticed a few discrepancies/opportunities for clarification for someone like me that has no native Android knowledge:

1. In the first Android bullet point "If your app is in the Google Play Store, update build.gradle...". It would be helpful to highlight that the correct file is android/app/build.gradle and NOT android/build.gradle
2. Would be helpful to know where to put CustomApplicationClass.java
3. In the CustomApplicationClass.java section, the filename indicated at the top of the code snippet refers incorrectly AndroidManifest.xml.

Thought this might be best shared here but let me know if I should send this somewhere else.

[webuniverseio]

I'm in a similar situation, would be nice for branch team to review. It is also not clear if <_ name="branch_test_mode">true</_> should be a string or bool, because right now it is both due to a typo

[Brandi-Youreka]

I am also a bit confused as to where to put the CustomApplicationClass.java file.