update latest VMAccessAgent version to 2.4 instead of 2.0

version 2.0 is pretty old and users should use 2.4 instead
so  I'm modifying the sample here to ensure they're using latest version.

Author: axelgMS

src/Compute/Compute/help/Set-AzVMAccessExtension.md

@@ -27,7 +27,7 @@ The **Set-AzVMAccessExtension** cmdlet adds the Virtual Machine Access (VMAccess
 
 ### Example 1: Add a VMAccess extension
 ```
-PS C:\> Set-AzVMAccessExtension -ResourceGroupName "ResourceGroup11" -Location "Central US" -VMName "VirtualMachine07" -Name "ContosoTest" -TypeHandlerVersion "2.0" -UserName "PFuller" -Password "Password"
+PS C:\> Set-AzVMAccessExtension -ResourceGroupName "ResourceGroup11" -Location "Central US" -VMName "VirtualMachine07" -Name "ContosoTest" -TypeHandlerVersion "2.4" -UserName "PFuller" -Password "Password"
 ```
 
 This command adds a VMAccess extension for the virtual machine named VirtualMachine07 in ResourceGroup11.