Fix misleading comment in RCTFabricSurface API
Fix misleading comment in RCTFabricSurface API

Summary:
Using RCTFabricSurface in bridgeless mode, this comment seems incorrect to me.

`[_surface start]`  needs to be called after initialization, or else the stage and `SurfacePresenter` registration never happen.

Maybe this comment used to be true, but it is misleading with the current implementation.

Changelog: [Internal]

Reviewed By: shergin

Differential Revision: D22800934

fbshipit-source-id: c396cbd3fc1749b8e7ab571c9e7bc05cd352fc14

arthuralee/react-native,pandiaraj44/react-native,hoangpham95/react-native,janicduplessis/react-native,arthuralee/react-native,facebook/react-native,javache/react-native,pandiaraj44/react-native,pandiaraj44/react-native,myntra/react-native,hoangpham95/react-native,pandiaraj44/react-native,javache/react-native,janicduplessis/react-native,myntra/react-native,myntra/react-native,myntra/react-native,janicduplessis/react-native,facebook/react-native,facebook/react-native,javache/react-native,janicduplessis/react-native,javache/react-native,janicduplessis/react-native,facebook/react-native,pandiaraj44/react-native,pandiaraj44/react-native,pandiaraj44/react-native,javache/react-native,javache/react-native,myntra/react-native,pandiaraj44/react-native,myntra/react-native,javache/react-native,arthuralee/react-native,hoangpham95/react-native,hoangpham95/react-native,facebook/react-native,facebook/react-native,janicduplessis/react-native,janicduplessis/react-native,hoangpham95/react-native,arthuralee/react-native,janicduplessis/react-native,facebook/react-native,myntra/react-native,arthuralee/react-native,hoangpham95/react-native,javache/react-native,myntra/react-native,facebook/react-native,myntra/react-native,javache/react-native,hoangpham95/react-native,facebook/react-native,hoangpham95/react-native