Add proper Stetho debugging setup documentation
Add proper Stetho debugging setup documentation

Summary:
Adding the proper way to setup Stetho debugging, based on this post: https://medium.com/andr3wjack/stetho-with-react-native-87642e5d7131#.352jqqavc

with updated OkHttp API.

**Test plan**

 + Manual test, DYI.
Closes https://github.com/facebook/react-native/pull/12232

Differential Revision: D5568733

Pulled By: hramos

fbshipit-source-id: 6006b9daa48024742b948f5fd33a07545549397c

negativetwelve/react-native,kesha-antonov/react-native,javache/react-native,ptmt/react-native-macos,hoangpham95/react-native,cdlewis/react-native,hammerandchisel/react-native,cdlewis/react-native,frantic/react-native,ptmt/react-native-macos,jevakallio/react-native,jevakallio/react-native,cdlewis/react-native,exponent/react-native,cdlewis/react-native,negativetwelve/react-native,jevakallio/react-native,negativetwelve/react-native,farazs/react-native,rickbeerendonk/react-native,exponentjs/react-native,kesha-antonov/react-native,hoangpham95/react-native,facebook/react-native,kesha-antonov/react-native,hoastoolshop/react-native,javache/react-native,hoangpham95/react-native,facebook/react-native,janicduplessis/react-native,makadaw/react-native,exponent/react-native,exponent/react-native,kesha-antonov/react-native,javache/react-native,frantic/react-native,ptmt/react-native-macos,janicduplessis/react-native,negativetwelve/react-native,arthuralee/react-native,hoastoolshop/react-native,janicduplessis/react-native,javache/react-native,ptmt/react-native-macos,jevakallio/react-native,negativetwelve/react-native,hoangpham95/react-native,dikaiosune/react-native,javache/react-native,negativetwelve/react-native,exponentjs/react-native,cdlewis/react-native,makadaw/react-native,pandiaraj44/react-native,pandiaraj44/react-native,rickbeerendonk/react-native,hammerandchisel/react-native,hammerandchisel/react-native,myntra/react-native,myntra/react-native,hammerandchisel/react-native,javache/react-native,hoangpham95/react-native,jevakallio/react-native,myntra/react-native,cdlewis/react-native,hoangpham95/react-native,jevakallio/react-native,ptmt/react-native-macos,hammerandchisel/react-native,farazs/react-native,cdlewis/react-native,ptmt/react-native-macos,farazs/react-native,javache/react-native,Bhullnatik/react-native,javache/react-native,Bhullnatik/react-native,pandiaraj44/react-native,frantic/react-native,frantic/react-native,exponentjs/react-native,exponentjs/react-native,farazs/react-native,kesha-antonov/react-native,janicduplessis/react-native,exponentjs/react-native,kesha-antonov/react-native,ptmt/react-native-macos,makadaw/react-native,makadaw/react-native,negativetwelve/react-native,facebook/react-native,facebook/react-native,rickbeerendonk/react-native,dikaiosune/react-native,Bhullnatik/react-native,rickbeerendonk/react-native,arthuralee/react-native,farazs/react-native,makadaw/react-native,facebook/react-native,myntra/react-native,hoangpham95/react-native,makadaw/react-native,makadaw/react-native,exponent/react-native,cdlewis/react-native,rickbeerendonk/react-native,Bhullnatik/react-native,jevakallio/react-native,myntra/react-native,dikaiosune/react-native,makadaw/react-native,facebook/react-native,jevakallio/react-native,cdlewis/react-native,janicduplessis/react-native,pandiaraj44/react-native,ptmt/react-native-macos,hoastoolshop/react-native,exponentjs/react-native,myntra/react-native,farazs/react-native,exponent/react-native,arthuralee/react-native,myntra/react-native,facebook/react-native,rickbeerendonk/react-native,arthuralee/react-native,pandiaraj44/react-native,dikaiosune/react-native,hoastoolshop/react-native,exponent/react-native,farazs/react-native,facebook/react-native,javache/react-native,hoastoolshop/react-native,farazs/react-native,makadaw/react-native,facebook/react-native,janicduplessis/react-native,arthuralee/react-native,negativetwelve/react-native,hammerandchisel/react-native,hammerandchisel/react-native,hoastoolshop/react-native,janicduplessis/react-native,farazs/react-native,pandiaraj44/react-native,frantic/react-native,pandiaraj44/react-native,exponent/react-native,hoastoolshop/react-native,myntra/react-native,kesha-antonov/react-native,pandiaraj44/react-native,exponent/react-native,rickbeerendonk/react-native,Bhullnatik/react-native,exponentjs/react-native,kesha-antonov/react-native,myntra/react-native,rickbeerendonk/react-native,dikaiosune/react-native,dikaiosune/react-native,Bhullnatik/react-native,Bhullnatik/react-native,kesha-antonov/react-native,janicduplessis/react-native,dikaiosune/react-native,hammerandchisel/react-native,rickbeerendonk/react-native,exponentjs/react-native,hoangpham95/react-native,Bhullnatik/react-native,hoastoolshop/react-native,dikaiosune/react-native,negativetwelve/react-native,jevakallio/react-native