Update v2 reference to v3

Author: unfulvio

source/includes/membership_plans/_get.md

@@ -70,7 +70,7 @@ This endpoint retrieves all membership plans.
 
 ### HTTP Request
 
-`GET http://example.com/api/wc/v2/memberships/plans`
+`GET http://example.com/api/wc/v3/memberships/plans`
 
 ### Query Parameters
 

source/includes/user_memberships/_get.md

@@ -132,7 +132,7 @@ $woocommerce->get( 'memberships/members/<id>' );
     ],
     "customer": [
       {
-        "href": "http://example.com/wp-json/wc/v2/customers/80"
+        "href": "http://example.com/wp-json/wc/v3/customers/80"
       }
     ]
   }