Fix Az.SqlVirtualMachine Syntax Errors (Azure#17806)

* Fix Az.SqlVirtualMachine Syntax Errors

* Fix Az.SqlVirtualMachine Syntax Errors

Author: v-yuzhichen

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

@@ -46,7 +46,7 @@ The Update-AzSqlVM cmdlet updates a sql virtual machine.
 ### Example 1
 ```powershell
 $tags = @{'key'='value'}
-$vm = Update-AzSqlVM -InputObject $vm -Tags $tags
+$vm = Update-AzSqlVM -InputObject $vm -Tag $tags
 $group.Tags
 ```
 

src/SqlVirtualMachine/SqlVirtualMachine/help/Update-AzSqlVMGroup.md

@@ -45,7 +45,7 @@ The Update-AzSqlVMGroup cmdlet updates a sql virtual machine group.
 ### Example 1
 ```powershell
 $tags = @{'key'='value'}
-$group = Update-AzSqlVMGroup -InputObject $group -Tags $tags
+$group = Update-AzSqlVMGroup -InputObject $group -Tag $tags
 $group.Tags
 ```