update migration docs to be more explicit (#3028)

* update migration docs to be more explicit

* try to appease prettier

* Update website/versioned_docs/version-0.20/migration-guides/yew/from-0_19_0-to-0_20_0.mdx

Co-authored-by: WorldSEnder <WorldSEnder@users.noreply.github.com>

Co-authored-by: WorldSEnder <WorldSEnder@users.noreply.github.com>

website/versioned_docs/version-0.20/migration-guides/yew/from-0_19_0-to-0_20_0.mdx

@@ -50,6 +50,14 @@ The reducer function can see all previous changes at the time they are run.
 
 You need to enable feature `csr` to use `yew::Renderer`.
 
+For example, to use client side rendering to render a typical app component:
+
+```rust ,ignore
+yew::Renderer::<App>::new().render();
+```
+
+For more options, see [the docs](https://docs.rs/yew/0.20/yew/struct.Renderer.html).
+
 ## `ref` prop for Components
 
 Components no longer have a `ref` prop. Trying to add a node ref to a component