Summary:
Currently there is a typo in Accessibility.md which will result in an invalid prop type warning if directly adhered to. The instance of `no-hide-descendant` should instead be updated to `no-hide-descendants` (plural) in the documentation.
Closes https://github.com/facebook/react-native/pull/10566
Differential Revision: D4082750
Pulled By: lacker
fbshipit-source-id: 18e2d9db6004767903e9308a2c0a900d2d9055fc