docs: mention AppCompatActivity constraint with Expo #535

Job	Run time
Check changeset	2m 5s
Build & static code analysis	2m 31s
Android road test (RNApp & AndroidApp - Vanilla)	22m 12s
Android road test (TesterIntegrated)	14m 20s
Android road test (RNApp & AndroidApp - Expo)	41m 2s
iOS road test (RNApp & AppleApp - Expo)	16m 51s
iOS road test (TesterIntegrated)	6m 19s
iOS road test (RNApp & AppleApp - Vanilla)	8m 53s
	1h 54m 13s

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