Typo "a Azure"→"an Azure" (#23235)

https://learn.microsoft.com/en-us/powershell/module/az.resources/new-azresourcelock?view=azps-10.4.1
https://github.com/Azure/azure-powershell/blob/main/src/Resources/Resources/help/New-AzResourceLock.md
#PingMSFTDocs

Author: hyoshioka0128

src/Resources/Resources/help/New-AzResourceLock.md

@@ -72,7 +72,7 @@ This command creates a resource lock on a website.
 New-AzResourceLock -LockLevel CanNotDelete -LockNotes "Lock note" -LockName "db-lock" -ResourceName "server1/ContosoDB"  -ResourceGroupName "RG1" -ResourceType "Microsoft.Sql/servers/databases"
 ```
 
-This command creates a resource lock on a Azure database.
+This command creates a resource lock on an Azure database.
 
 ## PARAMETERS