Update releasing guide

Summary:This is WIP as I am going through release steps. Submitting few ideas.

List:
- NDK is actually needed in the first step for the e2e scripts to run.
Closes facebook#7038

Differential Revision: D3191761

Pulled By: mkonicek

fb-gh-sync-id: e6bd51b3c339ed430086f4e21a3b3e6c3864f06f
fbshipit-source-id: e6bd51b3c339ed430086f4e21a3b3e6c3864f06f

Releases.md

@@ -33,11 +33,11 @@ are green and then run
 
 This script runs end to end with a proxy npm repository on local PC and asks to check that Chrome Debugging works.
 
-#### Cut a release branch and push to github
-
-To cut a release branch and check that everything works, you'll need Mac OS with the
+**Note**: In order to run the e2e tests, you'll need Mac OS with the
 [Android dev environment set up](https://github.com/facebook/react-native/blob/master/ReactAndroid/README.md).
 
+#### Cut a release branch and push to github
+
 Run:
 
 ```