docs: reach -> rich (#738)

## 📜 Description

Fixed typo 🙃 

## 💡 Motivation and Context

Thanks to @hirbod who spotted that issue 🙌 

## 📢 Changelog

<!-- High level overview of important changes -->
<!-- For example: fixed status bar manipulation; added new types
declarations; -->
<!-- If your changes don't affect one of platform/language below - then
remove this platform/language -->

### JS

- Reach -> Rich

## 🤔 How Has This Been Tested?

Tested manually on `localhost:3000`.

## 📸 Screenshots (if appropriate):

<!-- Add screenshots/video if needed -->
<!-- That would be highly appreciated if you can add how it looked
before and after your changes -->

## 📝 Checklist

- [x] CI successfully passed
- [x] I added new mocks and corresponding unit-tests if library API was
changed

docs/src/components/HomepageFeatures/index.tsx

@@ -41,7 +41,7 @@ const FeatureList: FeatureItem[] = [
     ),
   },
   {
-    title: "Reach metadata",
+    title: "Rich metadata",
     lottie: textInputs,
     description: (
       <>