Change Get-AzAlertHistory title and description (#13816)

* change alert history title and description

* add release note to change log

* remove changelog

as only doc was changed

Co-authored-by: Yeming Liu <[email protected]>

Author: hutzleo

src/Monitor/Monitor/help/Get-AzAlertHistory.md

@@ -9,7 +9,7 @@ schema: 2.0.0
 # Get-AzAlertHistory
 
 ## SYNOPSIS
-Gets the history of alerts.
+Gets the history of classic alert rules.
 
 ## SYNTAX
 
@@ -19,7 +19,7 @@ Get-AzAlertHistory [-ResourceId <String>] [-StartTime <DateTime>] [-EndTime <Dat
 ```
 
 ## DESCRIPTION
-The **Get-AzAlertHistory** cmdlet gets the history of alerts as they are enabled, disabled, fired, resolved, and so on.
+The **Get-AzAlertHistory** cmdlet gets the history of classic alert rules as they are enabled, disabled, fired, resolved, and so on.
 
 ## EXAMPLES