FLN-345 NLv3 api: Add get list unsubscribes endpoint

source/API_Reference/Marketing_Emails_API/emails.md

@@ -77,6 +77,8 @@ Get the email addresses and associated fields for a Recipient List.
 
   {% parameter list Yes 'Must be an existing Recipient List.' 'The list which you are adding email addresses too.' %}  
   {% parameter email No 'Must be an email address or list of addresses.' 'Optional email addresses to search for in the Recipient List.' %}
+  {% parameter unsubscribed No 'Must be set to 1' 'To retrieve a list of unsubscribed email addresses' %}
+
 {% endparameters %}
 
 {% apiexample get GET https://api.sendgrid.com/api/newsletter/lists/email/get list=Test&api_user=your_sendgrid_username&api_key=your_sendgrid_password %}