Update init.md

[I-am-Pritam-20]

init commands have been changed to react-native-community/cli@latest from react-native@latest. And some more similar changes.

** Check for yarn related commands.

Summary

Test Plan

Checklist

• Documentation is up to date.
• Follows commit message convention described in CONTRIBUTING.md.
• For functional changes, my test plan has linked these CLI changes into a local react-native checkout (instructions).

[thymikee]

Thanks!