Update New-AzMySqlFlexibleServer.md

Author: msJinLei

src/MySql/MySql/help/New-AzMySqlFlexibleServer.md

@@ -29,7 +29,7 @@ Creates a new MySQL flexible server.
 
 ### Example 1: Create a new MySql flexible server with arguments
 ```powershell
-$password = ConvertTo-SecureString -String "1234" -Force -AsPlainText
+$password = ConvertTo-SecureString -String <YourPassword> -Force -AsPlainText
 New-AzMySqlFlexibleServer -Name mysql-test -ResourceGroupName PowershellMySqlTest -Location eastus -AdministratorUserName mysqltest -AdministratorLoginPassword $password -Sku Standard_D2ds_v4 -SkuTier Burstable -Version 12 -StorageInMb 20480 -PublicAccess none -Zone 1 -BackupRetentionDay 10 -StorageAutogrow Enabled -Iops 500 -HighAvailability ZoneRedundant
 ```