docs: mention transformer in RN docs

Author: vonovak

website/docs/tutorials/react-native.md

@@ -238,6 +238,7 @@ The important point here is that the sentence isn't broken into pieces but remai
 
 ## Further reading
 
+- [Metro transformer for `po` files](/docs/ref/metro-transformer.mdx)
 - [Common i18n patterns in React](/docs/tutorials/react-patterns.md)
 - [`@lingui/react` reference documentation](/docs/ref/react.md)
 - [`@lingui/cli` reference documentation](/docs/ref/cli.md)