Summary:
When creating Native UI Component per docs, it results in duplicate symbols error as explained in issue #12404
Instead of using RCT prefix, it is suggested to use RN prefix to avoid any duplicate symbols.
Closes https://github.com/facebook/react-native/pull/12523
Differential Revision: D4608532
Pulled By: hramos
fbshipit-source-id: 353cfee4bf2cea30706863af51cabe11e9394222