fix: spelling

Fixed spelling of `principal`.

Author: Thorsten Sauter

articles/azure-functions/functions-container-apps-hosting.md

@@ -78,7 +78,7 @@ az functionapp config container set --name <APP_NAME> --resource-group <MY_RESOU
 
 ## Managed resource groups
 
-Azure Functions on Container Apps runs your containerized function app resources in specially managed resource groups. These managed resource groups help protect the consistency of your apps by preventing unintended or unauthorized modification or deletion of resources in the managed group, even by service principles. 
+Azure Functions on Container Apps runs your containerized function app resources in specially managed resource groups. These managed resource groups help protect the consistency of your apps by preventing unintended or unauthorized modification or deletion of resources in the managed group, even by service principals. 
 
 A managed resource group is created for you the first time you create function app resources in a Container Apps environment. Container Apps resources required by your containerized function app run in this managed resource group. Any other function apps that you create in the same environment use this existing group.