Fix method name in changelog

Author: gaearon

CHANGELOG.md

@@ -20,7 +20,7 @@
 ### React DOM
 
 * Add a new `getDerivedStateFromProps()` lifecycle and `UNSAFE_` aliases for the legacy lifecycles. ([@bvaughn](https://github.com/bvaughn) in [#12028](https://github.com/facebook/react/pull/12028))
-* Add a new `getSnapshotForUpdate()` lifecycle. ([@bvaughn](https://github.com/bvaughn) in [#12404](https://github.com/facebook/react/pull/12404))
+* Add a new `getSnapshotBeforeUpdate()` lifecycle. ([@bvaughn](https://github.com/bvaughn) in [#12404](https://github.com/facebook/react/pull/12404))
 * Add a new `<React.StrictMode>` wrapper to help prepare apps for async rendering. ([@bvaughn](https://github.com/bvaughn) in [#12083](https://github.com/facebook/react/pull/12083))
 * Add support for `onLoad` and `onError` events on the `<link>` tag. ([@roderickhsiao](https://github.com/roderickhsiao) in [#11825](https://github.com/facebook/react/pull/11825))
 * Add support for `noModule` boolean attribute on the `<script>` tag. ([@aweary](https://github.com/aweary) in [#11900](https://github.com/facebook/react/pull/11900))