Updating the URLs to point at new domain name reactnative.dev

Summary:
We recently updated React Native's docs site to have its own domain reactnative.dev and needed to update the URLs in the source code

CHANGELOG:
[INTERNAL]

Reviewed By: hramos

Differential Revision: D20072842

fbshipit-source-id: 1970d9214c872a6e7abf697d99f8f5360b3b308e

Libraries/NativeAnimation/React-RCTAnimation.podspec

@@ -23,7 +23,7 @@ Pod::Spec.new do |s|
   s.name                   = "React-RCTAnimation"
   s.version                = version
   s.summary                = "A native driver for the Animated API."
-  s.homepage               = "http://facebook.github.io/react-native/"
+  s.homepage               = "https://reactnative.dev/"
   s.license                = package["license"]
   s.author                 = "Facebook, Inc. and its affiliates"
   s.platforms              = { :ios => "10.0", :tvos => "10.0" }