Fixed the Managed Identity Parameter Set Description of AccountId in Connect-AzAccounts (#26945)

* Fixed the Managed Identity parameter set description of AccountId in Connect-AzAccount

* Revise the help message

Author: msJinLei

src/Accounts/Accounts/Account/ConnectAzureRmAccount.cs

@@ -156,7 +156,7 @@ public class ConnectAzureRmAccountCommand : AzureContextModificationCmdlet, IMod
         [Parameter(ParameterSetName = AccessTokenParameterSet,
                     Mandatory = true, HelpMessage = "Account Id for access token")]
         [Parameter(ParameterSetName = ManagedServiceParameterSet,
-                    Mandatory = false, HelpMessage = "Account Id for managed service. Can be a managed service resource Id, or the associated client id. To use the SystemAssigned identity, leave this field blank.")]
+                    Mandatory = false, HelpMessage = "Client id of UserAssigned identity. To use the SystemAssigned identity, leave this field blank.")]
         [ValidateNotNullOrEmpty]
         public string AccountId { get; set; }
 

src/Accounts/Accounts/ChangeLog.md

@@ -19,6 +19,7 @@
 -->
 
 ## Upcoming Release
+* Fixed the Managed Identity parameter set description of `AccountId` in `Connect-AzAccount`.
 * Made the breaking change warnings about `Get-AzAccessToken` not appear when `-AsSecureString` is used.
 * Fixed an issue that cmdlets may report warnings of "KeyNotFoundException". #26624
 * Fixed an issue that the `-AppliesTo` parameter of `Update-AzConfig` does not work as expected.

src/Accounts/Accounts/help/Connect-AzAccount.md

@@ -317,9 +317,8 @@ Accept wildcard characters: False
 
 ### -AccountId
 
-Account Id / User Id / User Name to login with in **Default (UserWithSubscriptionId)** parameter set; Account ID for access token in **AccessToken** parameter set; Account ID for managed service in
-**ManagedService** parameter set. Can be a managed service resource ID, or the associated client ID.
-To use the system assigned identity, leave this field blank.
+Id for Account, associated with your access token.
+In **User** authentication flows, the AccountId is user name / user id; In **AccessToken** flow, it is the AccountId for the access token; In **ManagedService** flow, it is the associated client Id of UserAssigned identity. To use the SystemAssigned identity, leave this field blank.
 
 ```yaml
 Type: System.String