[docs] Update JDK location in dev instructions for Android Studio 2020.3.1
[docs] Update JDK location in dev instructions for Android Studio 2020.3.1

1. Android Studio 2020.3.1 (latest release) no longer seems to bundle a JDK
2. Android Studio 4.2 (previous release) switched from JDK 8 to JDK 11
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