Updated docs with available OpenID providers for Gerrit
Updated docs with available OpenID providers for Gerrit

Google does no longer serve as OpenID provider for our CR.
I've removed that info and included available providers.

Change-Id: Id85a84cd67008b301b941ba988fae7d209713bb1

ngraczewski/motech,LukSkarDev/motech,sebbrudzinski/motech,tectronics/motech,tectronics/motech,adamkalmus/motech,ngraczewski/motech,tstalka/motech,smalecki/motech,ngraczewski/motech,wstrzelczyk/motech,jefeweisen/motech,frankhuster/motech,sebbrudzinski/motech,shubhambeehyv/motech,shubhambeehyv/motech,wstrzelczyk/motech,smalecki/motech,tectronics/motech,wstrzelczyk/motech,pgesek/motech,wstrzelczyk/motech,kmadej/motech,smalecki/motech,justin-hayes/motech,tectronics/motech,LukSkarDev/motech,adamkalmus/motech,sebbrudzinski/motech,justin-hayes/motech,sebbrudzinski/motech,kmadej/motech,koshalt/motech,jefeweisen/motech,ngraczewski/motech,shubhambeehyv/motech,frankhuster/motech,kmadej/motech,frankhuster/motech,smalecki/motech,LukSkarDev/motech,tstalka/motech,tstalka/motech,koshalt/motech,kmadej/motech,koshalt/motech,justin-hayes/motech,pgesek/motech,shubhambeehyv/motech,jefeweisen/motech,pgesek/motech,justin-hayes/motech,frankhuster/motech,koshalt/motech,pgesek/motech,jefeweisen/motech,adamkalmus/motech,LukSkarDev/motech,adamkalmus/motech,tstalka/motech