Update New-ApplicationAccessPolicy.md

The cmdlet now supports -WhatIf

Author: agrosums

exchange/exchange-ps/exchange/New-ApplicationAccessPolicy.md

@@ -201,7 +201,7 @@ Accept wildcard characters: False
 ```
 
 ### -WhatIf
-The WhatIf switch doesn't work on this cmdlet.
+The WhatIf switch simulates the actions of the command. You can use this switch to view the changes that would occur without actually applying those changes. You don't need to specify a value with this switch.
 
 ```yaml
 Type: SwitchParameter