ISGR examples

PRD Section: * https://docs.google.com/document/d/1JEeAn_BO6ZbsIhOlT4WpRj3xwJnCot606nZZuG0_CLY/edit#heading=h.p7archdnn9my

• Docs schema (has been updated here):

• https://docs.couchbase.com/sync-gateway/current/configuration-schema-isgr.html

See slack conversation: converation:https://couchbase.slack.com/archives/CRWMUL4H5/p1690201569387509