Fix RNTester Path

[chirag-singhal]

Summary

• Corrects running on android instructions for rn-tester
• Corrects path for rn-tester in package.json, contributing.md and .buckconfig

Changelog

[General] [Fixed] - Fix rn-tester path in documentation and configs

[pull-bot]

	Warnings
⚠️	🔒 package.json - Changes were made to package.json. This will require a manual import by a Facebook employee.

	Messages
📖	📋 Missing Test Plan - Can you add a Test Plan? To do so, add a "## Test Plan" section to your PR description. A Test Plan lets us know how these changes were tested.

Generated by 🚫 dangerJS against d069a76

[chirag-singhal]

@rickhanlonii some minor fixes for the documentation and buckconfig

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	7,211,428	0
android	hermes	armeabi-v7a	6,860,602	0
android	hermes	x86	7,646,060	0
android	hermes	x86_64	7,537,004	0
android	jsc	arm64-v8a	9,370,138	0
android	jsc	armeabi-v7a	9,011,442	0
android	jsc	x86	9,232,862	0
android	jsc	x86_64	9,810,016	0

Base commit: 0fb7f5a

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: 0fb7f5a

[rickhanlonii]

Thanks!

[facebook-github-bot]

@rickhanlonii has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[react-native-bot]

This pull request was successfully merged by @chirag-singhal in abb6433.

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