Replace fburl.com link with public fb.me link

Summary:
Follow up from [this comment](1b22d49#commitcomment-25699227).
Closes #16892

Differential Revision: D6374118

Pulled By: bvaughn

fbshipit-source-id: e692985d6736986acc073fa036d413121ce51f41

Author: bvaughn

Libraries/ReactNative/renderApplication.js

@@ -38,7 +38,7 @@ function renderApplication<Props: Object>(
 
   // If the root component is async, the user probably wants the initial render
   // to be async also. To do this, wrap AppContainer with an async marker.
-  // For more info see https://fburl.com/tjpe0gpx
+  // For more info see https://fb.me/is-component-async
   if (
     RootComponent.prototype != null &&
     RootComponent.prototype.unstable_isAsyncReactComponent === true