fixed incorrect field name in `format` function example (#2252)
fixed incorrect field name in `format` function example (#2252)

* fixed incorrect field name in `format` function example

clarified optional `separator` parameter wording for `join` function description

* actually clarified optional `separator` parameter this time

sergiyprotsiv/openaddresses,openaddresses/openaddresses,davidchiles/openaddresses,sergiyprotsiv/openaddresses,orangejulius/openaddresses,slibby/openaddresses,orangejulius/openaddresses,sabas/openaddresses,tyrasd/openaddresses,davidchiles/openaddresses,astoff/openaddresses,astoff/openaddresses,slibby/openaddresses,tyrasd/openaddresses,sabas/openaddresses,sabas/openaddresses,mmdolbow/openaddresses,openaddresses/openaddresses,davidchiles/openaddresses,mmdolbow/openaddresses,astoff/openaddresses,sergiyprotsiv/openaddresses,openaddresses/openaddresses,mmdolbow/openaddresses,tyrasd/openaddresses,orangejulius/openaddresses,slibby/openaddresses