Change authorship in GitHub administration YAML

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

Author: rmcmurray

learn-pr/github/github-introduction-administration/2-what-is-github-administration.yml

@@ -5,8 +5,8 @@ metadata:
   title: What is GitHub administration?
   description: Overview of common GitHub administration tasks and hierarchical levels.
   ms.date: 09/20/2024
-  author: rmcmurray
-  ms.author: robmcm
+  author: lucie-docs
+  ms.author: aastewar
   ms.topic: unit
 durationInMinutes: 6
 content: |