Replace github client with phabricator client also in documentation (#5560)
Replace github client with phabricator client also in documentation (#5560)


guenter/marathon,guenter/marathon,mesosphere/marathon,gsantovena/marathon,guenter/marathon,janisz/marathon,mesosphere/marathon,gsantovena/marathon,mesosphere/marathon,meln1k/marathon,guenter/marathon,guenter/marathon,janisz/marathon,gsantovena/marathon,meln1k/marathon,janisz/marathon,mesosphere/marathon,meln1k/marathon,janisz/marathon,janisz/marathon,meln1k/marathon,meln1k/marathon,mesosphere/marathon,gsantovena/marathon,gsantovena/marathon