README: fix dead links and terminology (#2145)

* docs: fix dead link and term

* docs: revert format

Author: Naturalclar

README.md

@@ -39,7 +39,7 @@ This plugin provides client-side integration for the [CodePush service](https://
 
 ## How does it work?
 
-A React Native app is composed of JavaScript files and any accompanying [images](https://facebook.github.io/react-native/docs/images.html#content), which are bundled together by the [packager](https://github.com/facebook/react-native/tree/master/packager) and distributed as part of a platform-specific binary (i.e. an `.ipa` or `.apk` file). Once the app is released, updating either the JavaScript code (e.g. making bug fixes, adding new features) or image assets, requires you to recompile and redistribute the entire binary, which of course, includes any review time associated with the store(s) you are publishing to.
+A React Native app is composed of JavaScript files and any accompanying [images](https://reactnative.dev/docs/image), which are bundled together by the [metro bundler](https://github.com/facebook/metro) and distributed as part of a platform-specific binary (i.e. an `.ipa` or `.apk` file). Once the app is released, updating either the JavaScript code (e.g. making bug fixes, adding new features) or image assets, requires you to recompile and redistribute the entire binary, which of course, includes any review time associated with the store(s) you are publishing to.
 
 The CodePush plugin helps get product improvements in front of your end users instantly, by keeping your JavaScript and images synchronized with updates you release to the CodePush server. This way, your app gets the benefits of an offline mobile experience, as well as the "web-like" agility of side-loading updates as soon as they are available. It's a win-win!