Get-User: fix typo

Author: Schneider

exchange/exchange-ps/exchange/users-and-groups/Get-User.md

@@ -169,7 +169,7 @@ Accept wildcard characters: False
 ### -AuxAuditLog
 This parameter is available only in on-premises Exchange.
 
-The AuxAuditLog switch is required to return auxillary audit log mailboxes in the results. You don't need to specify a value with this switch.
+The AuxAuditLog switch is required to return auxiliary audit log mailboxes in the results. You don't need to specify a value with this switch.
 
 Audit log mailboxes are arbitration mailboxes that are used to store audit log settings.