Add line for omitted parameter update (#22757)

* Add line for omitted parameter update

https://portal.microsofticm.com/imp/v3/incidents/details/403606340/home

* Update src/SqlVirtualMachine/help/New-AzSqlVM.md

---------

Co-authored-by: Beisi Zhou <[email protected]>

Author: JamesFerebee

src/SqlVirtualMachine/help/New-AzSqlVM.md

@@ -59,7 +59,9 @@ New-AzSqlVM -Name <String> -ResourceGroupName <String> -Location <String> [-Subs
 ```
 
 ## DESCRIPTION
-Creates or updates a SQL virtual machine.
+Creates or updates a SQL virtual machine. 
+
+If you are updating an existing SQL virtual machine and a parameter such as -Tag is omitted, then the previously defined values may be removed. For this reason, it is recommended to use [Update-AzSqlVM](https://learn.microsoft.com/powershell/module/az.sqlvirtualmachine/update-azsqlvm) to prevent overwriting of unintended parameters.
 
 ## EXAMPLES