Update README

README.md

@@ -16,21 +16,21 @@ This repo uses a [Python script](build_readme.py), triggered by GitHub Actions,
 ## Topics
 
 <!-- toc starts -->
-- [Contributing TILs](#contributing-tils)
-- [GitHub](#github)
+- [Contributing tils](#contributing-tils)
+- [Github](#github)
 <!-- toc ends -->
 
 ## Index
 
 <!-- index starts -->
-### Contributing TILs
+### Contributing tils
 
 - [How to contribute a TIL](_contributing-TILs/_how-to-contribute.md) - 2024-08-11
 - [How to commit and push without GitHub Actions from running](_contributing-TILs/prevent-GitHub-actions.md) - 2024-08-11
 - [How to preview the `README.md` locally](_contributing-TILs/preview-README.md) - 2024-08-11
 - [How to push/pull without conflicts](_contributing-TILs/avoiding-conflicts.md) - 2024-08-11
 
-### GitHub
+### Github
 
 - [Adding alerts and notes to GitHub markdown](GitHub/alerts-and-notes-in-markdown.md) - 2024-08-11
 <!-- index ends -->