[RNMobile] Improvements to Getting Started Guides#40964

Merged

hypest merged 9 commits intotrunkfrom

rnmobile/update/getting-started-docs

May 23, 2022

Commits on May 16, 2022

Refine instructions for installing Cocoapods
SiobhyB
authored

Commits on May 17, 2022

Note `ffi` may already be installed
SiobhyB
authored