Fix typo in ui-components docs
Fix typo in ui-components docs

Summary: Closes https://github.com/facebook/Sonar/pull/26

Differential Revision: D8379209

Pulled By: danielbuechele

fbshipit-source-id: b5f2fe8de84e48a9cd43bb8cd3e79e21e6be470f

facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper