Add Link header info to paginated endpoints
Details have been added about the role that the HTTP "Link" response header plays in
pagination of GET /service, GET /service/{serivce\_id}/acl/{acl\_id}/entries, and
GET /service/{service\_id}/dictionary/{dictionary\_id}/items endpoints.
Prior change: Fastly Legacy WAF and WAF2020 APIs
Following change: New Cache Fetches and Compute Backend Stats
