Update spe-da-adv.md

Syntax for an array of hosts was wrong.

Author: ReidCarlberg

docs/embedded/development/declarative-agent/spe-da-adv.md

@@ -52,7 +52,7 @@ Connect-SPOService "https://<domain>-admin.sharepoint.com"
 # Login with your admin account.
 ...
 
-Set-SPOApplication -OwningApplicationId 423poi45 -CopilotEmbeddedChatHosts "http://localhost:3000 https://contoso.sharepoint.com https://fabrikam.com" 
+Set-SPOApplication -OwningApplicationId 423poi45 -CopilotEmbeddedChatHosts @("http://localhost:3000", "https://contoso.sharepoint.com", "https://fabrikam.com") 
 
 # This will set the container type configuration “CopilotEmbeddedChatHosts” accordingly. 
 ...