Update readme.md

Author: StanleyGoldman

docs/readme.md

@@ -32,9 +32,6 @@ Details about how the team is organizing and shipping GitHub for Unity:
 
 [Quick Guide](using/quick-guide.md)
 
-These documents contain more details on how to use the GitHub for Unity plugin:
-- **[Installing and Updating the GitHub for Unity package](using/how-to-install-and-update.md)**
-
 These documents contain more details on how to use the GitHub for Unity plugin:
 - **[Installing and Updating the GitHub for Unity package](using/how-to-install-and-update.md)**
 - **[Getting Started with the GitHub for Unity package](using/getting-started.md)**