Add more codemods (#6921)

Author: rickhanlonii

src/content/blog/2024/04/25/react-19-upgrade-guide.md

@@ -405,7 +405,7 @@ root.render(<App />);
 
 <Note>
 
-Codemod `ReactDOM.render` to `ReactDOM.createRoot`:
+Codemod `ReactDOM.render` to `ReactDOMClient.createRoot`:
 
 ```bash
 npx codemod@latest react/19/replace-reactdom-render
@@ -427,6 +427,15 @@ import {hydrateRoot} from 'react-dom/client';
 hydrateRoot(document.getElementById('root'), <App />);
 ```
 
+<Note>
+
+Codemod `ReactDOM.hydrate` to `ReactDOMClient.hydrateRoot`:
+
+```bash
+npx codemod@latest react/19/replace-reactdom-render
+```
+
+</Note>
 
 #### Removed: `unmountComponentAtNode` {/*removed-unmountcomponentatnode*/}
 
@@ -443,8 +452,18 @@ root.unmount();
 
 For more see `root.unmount()` for [`createRoot`](https://react.dev/reference/react-dom/client/createRoot#root-unmount) and [`hydrateRoot`](https://react.dev/reference/react-dom/client/hydrateRoot#root-unmount).
 
+<Note>
+
+Codemod `unmountComponentAtNode` to `root.unmount`:
+
+```bash
+npx codemod@latest react/19/replace-reactdom-render
+```
+
+</Note>
 
 #### Removed: `ReactDOM.findDOMNode` {/*removed-reactdom-finddomnode*/}
+
 `ReactDOM.findDOMNode` was [deprecated in October 2018 (v16.6.0)](https://legacy.reactjs.org/blog/2018/10/23/react-v-16-6.html#deprecations-in-strictmode). 
 
 We're removing `findDOMNode` because it was a legacy escape hatch that was slow to execute, fragile to refactoring, only returned the first child, and broke abstraction levels (see more [here](https://legacy.reactjs.org/docs/strict-mode.html#warning-about-deprecated-finddomnode-usage)). You can replace `ReactDOM.findDOMNode` with [DOM refs](/learn/manipulating-the-dom-with-refs):