add detail on unit of time for access token epxiration (#824)
add detail on unit of time for access token epxiration (#824)

Co-authored-by: Adam Rodriguez <45e12f1d702f49497ce2b424ade400714b39beae@he.local>
Co-authored-by: Ben Ramsey <73675debcd8a436be48ec22211dcf44fe0df0a64@benramsey.com>
stevenmaguire/oauth2-client,thephpleague/oauth2-client