docs(auth, phone): add link to upstream android setup instructions

[dqii]

Description

Related issues

Release Summary

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • [ x] Yes
• My change supports the following platforms;
  • [ x] Android
  • iOS
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • [ x] No

Test Plan

No tests, just adding some documentation

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[mikehardy]

Nice! This is a good catch on a missing part, I think the SafetyNet stuff especially is semi-new upstream vs the docs and now we really need to refer upstream
Thanks for taking the time to post this, I'm sure it will help future people

[mikehardy]

This will need the CLA signed before we can merge, even though it's tiny - you may follow the details link on the CLA action or the ones in the comment from the CLA bot to get it signed, thank you!

[dqii]

Just submitted I think! :) Sorry about that

[mikehardy]

boom 💥 😄 thanks