The PR states "When couchdb.public_users is set to true, getting /_users/id will
return user document with sensitive information stripped." Further, in `couch_users_db.erl` you specify `couch_config:get("couch_httpd_auth", "public_fields", "")` which defaults the equivalent to empty. 

Can you update the text of the PR to match the implementation and/or confirm that the default, same as `public_fields =`, will be the same as the current behaviour?