Add Eclipse Update Site for the GitHub Copilot Eclipse plug-in (#36645)

Co-authored-by: Ben Ahmady <[email protected]>

Author: thahnen

content/copilot/managing-copilot/configure-personal-settings/installing-the-github-copilot-extension-in-your-environment.md

@@ -244,7 +244,7 @@ To see instructions for other popular coding environments, use the tool switcher
 
 ## Installing {% data variables.product.prodname_copilot %} in Eclipse
 
-1. Download and install the latest version of {% data variables.product.prodname_copilot %} in the [Eclipse Marketplace](https://aka.ms/copiloteclipse).
+1. Download and install the latest version of {% data variables.product.prodname_copilot %} from the [Eclipse Marketplace](https://aka.ms/copiloteclipse) or directly via the [Eclipse Update Site](https://azuredownloads-g3ahgwb5b8bkbxhd.b01.azurefd.net/github-copilot/). For more information, see [Installing New Software](https://help.eclipse.org/latest/topic/org.eclipse.platform.doc.user/tasks/tasks-124.htm) in the Eclipse documentation.
 
 1. After the extension is installed, restart Eclipse to apply the changes.