Add note about implementation of oauth2
Add note about implementation of oauth2

Reading the oauth2 token documentation is misleading as it makes
no mention of it being a newer feature which may not be supported
by the token server. Add a note mentioning if it is not supported
to refer to the token documentation for getting a token.

Signed-off-by: Derek McGowan <e1c79a582b6629e6b39e9679f4bb964d25db4aa8@mcgstyle.net> (github: dmcgowan)

dmcgowan/distribution,duglin/distribution,konnase/distribution,harrisonfeng/distribution,jzwlqx/distribution,huamai-io/distribution,sergeyfd/distribution,dobril-stanga/distribution,jwhonce/distribution,yuwaMSFT2/distribution,konnase/distribution,shyr/distribution,konstruktoid/distribution,manoj535/distribution,thaJeztah/distribution,miminar/distribution,mikebrow/distribution,mbentley/distribution,yuwaMSFT2/distribution,jwhonce/distribution,sadlil/distribution,docker/distribution,vdemeester/distribution,estesp/distribution,thaJeztah/distribution,cezarsa/distribution,estesp/distribution,jzwlqx/distribution,dobril-stanga/distribution,spacexnice/distribution,huamai-io/distribution,harrisonfeng/distribution,mikebrow/distribution,spacexnice/distribution,nwt/distribution,duglin/distribution,shyr/distribution,vdemeester/distribution,RichardScothern/distribution,nwt/distribution,miminar/distribution,sergeyfd/distribution,cezarsa/distribution,manoj535/distribution,mbentley/distribution,RichardScothern/distribution,konstruktoid/distribution,sadlil/distribution,docker/distribution,dmcgowan/distribution