docs(en): update polyfill import according to core-js 3 docs (vuejs#5130)

Author: llccing

docs/guide/browser-compatibility.md

@@ -38,7 +38,7 @@ If one of your dependencies need polyfills, you have a few options:
     It's recommended to add polyfills this way instead of directly importing them in your source code, because polyfills listed here can be automatically excluded if your `browserslist` targets don't need them.
     :::
 
-3. **If the dependency ships ES5 code, but uses ES6+ features without explicitly listing polyfill requirements (e.g. Vuetify):** Use `useBuiltIns: 'entry'` and then add `import '@babel/polyfill'` to your entry file. This will import **ALL** polyfills based on your `browserslist` targets so that you don't need to worry about dependency polyfills anymore, but will likely increase your final bundle size with some unused polyfills.
+3. **If the dependency ships ES5 code, but uses ES6+ features without explicitly listing polyfill requirements (e.g. Vuetify):** Use `useBuiltIns: 'entry'` and then add `import 'core-js/stable'; import 'regenerator-runtime/runtime';` to your entry file. This will import **ALL** polyfills based on your `browserslist` targets so that you don't need to worry about dependency polyfills anymore, but will likely increase your final bundle size with some unused polyfills.
 
 See [@babel-preset/env docs](https://new.babeljs.io/docs/en/next/babel-preset-env.html#usebuiltins-usage) for more details.