[ACR] Tasks MSI principal

Author: dlepow

articles/container-registry/container-registry-tasks-authentication-managed-identity.md

@@ -87,12 +87,12 @@ Depending on the requirements of your task, grant the identity permissions to ac
 
 Use the [Azure CLI](../role-based-access-control/role-assignments-cli.md) or other Azure tools to manage role-based access to resources. For example, run the [az role assignment create][az-role-assignment-create] command to assign the identity a role to the resource. 
 
-The following example assigns a managed identity the permissions to pull from a container registry. The command specifies the *service principal ID* of the identity and the *resource ID* of the target registry.
+The following example assigns a managed identity the permissions to pull from a container registry. The command specifies the *principal ID* of the task identity and the *resource ID* of the target registry.
 
 
 ```azurecli
 az role assignment create \
-  --assignee <servicePrincipalID> \
+  --assignee <orincipalID> \
   --scope <registryID> \
   --role acrpull
 ```

includes/container-registry-tasks-system-id-properties.md

@@ -10,7 +10,7 @@ ms.date: 07/12/2019
 ms.author: danlep
 ms.custom: include file
 ---
-In the command output, the `identity` section shows an identity of type `SystemAssigned` is set in the task. The `principalId` is the service principal ID of the identity:
+In the command output, the `identity` section shows an identity of type `SystemAssigned` is set in the task. The `principalId` is the principal ID of the task identity:
 
 ```console
 [...]