Packages: Update the note about using polyfill for ES2015+ features #34878
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Description
WordPress Core dropped support for IE 11 in the 5.8 release. At the same time we created a polyfill to ES2015+ features that better reflects the needs of the WordPress ecosystem knowing exactly the target supported browsers. Let's update README files in all packages to recommend the custom polypill that WordPress Core is using.
I see that Visual Studio Code triggered Prettier run on all modified files, but that can be ignored. We don't validate the file formatting in markdown files yet, so this is something that still happens from time to time.
Props to @ciampo for the copy update when improving the README file in
@wordpress/components
.