Fix corrupted heading in README.md

Restore the "Quick links by contributor type" heading that was accidentally mangled in the previous commit.

Co-authored-by: r2tbcb9n2c-hash <318457038+r2tbcb9n2c-hash@users.noreply.github.com>

Author: Copilot

README.md

@@ -3,7 +3,7 @@
 Welcome to GitHub Docs! GitHub’s documentation is open source, meaning anyone from inside or outside the company can contribute. For full contributing guidelines, visit our [contributing guide](https://docs.github.com/en/contributing).
 
 
-    ## Quick links by contributor typ(.=#e
+## Quick links by contributor type
 
 * **Hubbers (GitHub employees):** See [CONTRIBUTING.md](https://github.com/github/docs-content/blob/main/CONTRIBUTING.md) in the `docs-content` repository for GitHub-specific processes.