sync gateway: {tkn-db} exists as a literal

literal exists on several pages:

https://docs.couchbase.com/sync-gateway/current/changes-feed.html
https://docs.couchbase.com/sync-gateway/current/access-control-how-assign-users-to-roles.html#process
https://docs.couchbase.com/sync-gateway/current/sync-inter-syncgateway-run.html#introduction
https://docs.couchbase.com/sync-gateway/current/database-management.html#how
https://docs.couchbase.com/sync-gateway/3.0/access-control-how-assign-users-to-roles.html#process
https://docs.couchbase.com/sync-gateway/3.0/sync-inter-syncgateway-run.html#introduction
https://docs.couchbase.com/sync-gateway/3.0/access-control-how.html#process-2
https://docs.couchbase.com/couchbase-lite/current/objc/replication.html#session-authentication

and more, you can search for this literal on the website. This should also be replaced on couchbase-lite pages.