Change authors in GitHub authentication documentation

Updated author and ms.author fields in the YAML file.

Author: rmcmurray

learn-pr/github/github-introduction-administration/3-how-github-authentication-works.yml

@@ -5,8 +5,8 @@ metadata:
   title: How does GitHub authentication work?
   description: Discover the ways in which administrators can configure GitHub authentication.
   ms.date: 09/20/2024
-  author: rmcmurray
-  ms.author: robmcm
+  author: lucie-docs
+  ms.author: aastewar
   ms.topic: unit
 durationInMinutes: 6
 content: |