[docs] Add note about minimum required webpack version (#43864)

docs/data/material/getting-started/supported-platforms/supported-platforms.md

@@ -39,3 +39,7 @@ Have a look at the older [versions](https://mui.com/versions/) for backward comp
 
 Material UI requires a minimum version of TypeScript 4.7.
 This aims to match the policy of [DefinitelyTyped](https://github.com/DefinitelyTyped/DefinitelyTyped), with the support of the versions of TypeScript that are less than two years old.
+
+## Webpack
+
+The minimium required version of webpack to bundle applications that use Material UI is v5. Webpack <= v4 can't bundle Material UI untranspiled as it uses features such as the [null coalscing operator (`??`)](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing) and [optional chaining (`?.`)](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining).