Update index.yml

Author: Chukslord1

learn-pr/github/github-introduction-products/index.yml

@@ -36,6 +36,9 @@ units:
   - learn.github.github-introduction-products.what-are-github-products
   - learn.github.github-introduction-products.how-licensing-works
   - learn.github.github-introduction-products.github-billing
+  - learn.github.github-introduction-products.license-usage-stats
+  - learn.github.github-introduction-products.license-usage-machine
+  - learn.github.github-introduction-products.metered-usage-consumption-reports
   - learn.github.github-introduction-products.knowledge-check
   - learn.github.github-introduction-products.summary
 badge: