Update documentation with info about new authorizations api.
Update documentation with info about new authorizations api.

GistBox/github,MalachiTatum/github,befairyliu/github,samphilipd/github,joshsoftware/github,anabhilash619/github,yaoxiaoyong/github,firstval/github,durai145/github,wicky-info/github,davengeo/github,cocktail-io/github,peter-murach/github,piotrmurach/github