[docs][material-ui] Add supported browsers section to migration guide (…

…#42194)

docs/data/material/migration/migration-v5/migration-v5.md

@@ -14,6 +14,28 @@ In the `package.json` file, change the package version from `latest` to `next`.
 Using `next` ensures your project always uses the latest v6 alpha release.
 Alternatively, you can also target and fix it to a specific version, for example, `6.0.0-alpha.0`.
 
+## Supported browsers
+
+The targets of the default bundle have changed in v6.
+
+The exact versions will be pinned on release from the browserslist query `"> 0.5%, last 2 versions, Firefox ESR, not dead, safari >= 15.4, iOS >= 15.4"`.
+
+The stable bundle supports the following minimum versions:
+
+<!-- #stable-snapshot -->
+
+- Chrome 109 (up from 90)
+- Edge 121 (up from 91)
+- Firefox 115 (up from 78)
+- Safari 15.4 in both macOS and iOS (up from 14 in macOS and 12.5 in iOS)
+- and more (see [.browserslistrc (`stable` entry)](https://github.com/mui/material-ui/blob/v6.0.0/.browserslistrc#L16))
+
+### Removed support for IE 11
+
+Support for IE 11 is completely removed, by dropping the legacy bundle and all IE 11 related code.
+This allows us to decrease bundle size and keep the scope manageable.
+If you need to support IE 11, you can use Material UI v5's [legacy bundle](https://v5.mui.com/material-ui/guides/minimizing-bundle-size/#legacy-bundle), but it won't get updates or bug fixes.
+
 ## Breaking changes
 
 Since v6 is a new major release, it contains some changes that affect the public API.