clientState typo fix

Author: milanholemans

docs/apis/webhooks/lists/update-subscription.md

@@ -57,7 +57,7 @@ Name | Type | Description
 -----|------|------------
 notificationUrl|string|The service URL to send notifications to.
 expirationDateTime|date|The date the notification will expire and be deleted.
-client-clientState|string|Optional. Opaque string passed back to the client on all notifications.<br/>You can use this for validating notifications or tagging different subscriptions.
+clientState|string|Optional. Opaque string passed back to the client on all notifications.<br/>You can use this for validating notifications or tagging different subscriptions.
 
 
 ## Response